1915 Wars & Armed Conflicts Events — Verified Historical Highlights

1915 Wars & Armed Conflicts Events — Verified Historical Highlights | TakeMeBack.to

02 Jan Battle of Sarikamish - Russian artillery assault: The Battle of Sarikamish occurred from December 22, 1914, to January 17, 1915, between Russian and Ottoman forces. Russian forces launched an artillery assault during this period. source: en.wikipedia.org
03 Jan Battle of Sarikamish in Caucasus: The Battle of Sarikamish occurred from December 22, 1914, to January 17, 1915, between Russian and Ottoman forces in the Caucasus region. source: en.wikipedia.org
05 Jan Second Battle of Edéa in Cameroon: On January 5, 1915, during World War I, German forces launched a counter-attack against French troops stationed in the village of Edéa, Cameroon. The French forces, commanded by Colonel Mayer, successfully repelled the German assault, resulting in significant German casualties and consolidating Allied control in the region. source: en.wikipedia.org
13 Jan First Battle of Sarikamish: The Battle of Sarikamish was a significant engagement between the Russian and Ottoman Empires during World War I, occurring from December 22, 1914, to January 17, 1915. The battle resulted in a decisive Russian victory, with the Ottoman forces suffering severe losses due to inadequate preparation for harsh winter conditions. source: en.wikipedia.org
17 Jan Battle of Sarikamish: Russia defeats Ottoman Turkey: The Battle of Sarikamish concluded on January 17, 1915, with the Russian Empire defeating the Ottoman Third Army. The Ottomans suffered significant casualties, with estimates ranging from 50,000 to 60,000, including 7,000 prisoners. Russian forces sustained approximately 16,000 casualties, with an additional 12,000 lost to sickness, including exposure and frostbite. source: en.wikipedia.org
18 Jan Japan's Twenty-One Demands to China: On January 18, 1915, Japan presented the Twenty-One Demands to China, seeking to expand its influence during World War I. The demands included control over former German territories, extended leases in Manchuria, and significant political and economic concessions. The Chinese government, under President Yuan Shikai, was pressured to accept most of these demands, leading to increased anti-Japanese sentiment in China. source: britannica.com
24 Jan Battle of Rafajlowa during World War I: On the night of January 23–24, 1915, the Battle of Rafajlowa occurred in the Carpathian Mountains. The 2nd Brigade of the Polish Legions, part of the Austro-Hungarian Army, repelled a Russian night raid aimed at blocking passes through the Gorgany mountain range. The battle resulted in a Polish victory, with Russian forces retreating after facing significant casualties. source: en.wikipedia.org
04 Feb Germany declares war zone around British Isles: On February 4, 1915, Germany declared the waters surrounding Great Britain and Ireland, including the English Channel, a war zone. This declaration permitted German U-boats to attack and sink any enemy merchant vessels found within this area without warning, and also exposed neutral ships to potential attacks due to the risk of misidentification. source: history.com
06 Feb Second Battle of the Masurian Lakes: The Second Battle of the Masurian Lakes occurred from February 7 to 22, 1915, during World War I. German forces launched an offensive against Russian positions in East Prussia, resulting in a significant Russian retreat. source: history.com
07 Feb Second Battle of the Masurian Lakes: The Second Battle of the Masurian Lakes occurred from February 7 to 22, 1915, during World War I. German forces launched an offensive against Russian positions in East Prussia, resulting in a significant Russian retreat. source: history.com
08 Feb Second Battle of the Masurian Lakes: The German 10th Army launched an attack against the Russian line to capitalize on the success made by the 9th Army. Despite heavy snow and bad roads slowing advances, German soldiers managed to advance 120 km in a week and inflict severe casualties on the Russians. source: euronews.com
16 Feb Allied naval attack on Dardanelles begins: On February 16, 1915, Allied forces initiated a naval attack on the Dardanelles Strait, aiming to secure a sea route to Russia during World War I.
18 Feb Second Battle of the Masurian Lakes: On February 18, 1915, the Second Battle of the Masurian Lakes occurred, where German forces achieved a significant victory over Russian troops in East Prussia during World War I.
19 Feb First Naval Attack on Dardanelles in World War I: On February 19, 1915, British and French battleships initiated the first naval attack on the Dardanelles Straits, aiming to neutralize Ottoman coastal defenses. The operation began with a bombardment of the Orhaniye Tepe battery by HMS Cornwallis at 09:51, marking the start of the Dardanelles campaign. source: britannica.com
22 Feb Germany Launches Unrestricted Submarine Warfare in World War I: On February 22, 1915, Germany declared unrestricted submarine warfare, allowing German U-boats to attack Allied and neutral ships without warning, significantly escalating naval warfare during World War I. source: history.com
02 Mar British naval bombardment of Dardanelles forts: On March 2, 1915, British battleships, including HMS Canopus, participated in a naval bombardment targeting Ottoman coastal fortifications along the Dardanelles Strait. The operation aimed to suppress Turkish artillery positions defending the strait's entrance. During the engagement, HMS Canopus led the 4th Sub-Division, firing at the Dardanus fortress. The Turkish forces returned fire, accurately straddling Canopus and causing damage to her quarterdeck. Despite the damage, the British ships continued their bombardment for approximately two hours before withdrawing. source: en.wikipedia.org
10 Mar Battle of Neuve Chapelle Begins: The Battle of Neuve Chapelle commenced on March 10, 1915, as part of the British Expeditionary Force's efforts to break through German lines in northern France during World War I. source: en.wikipedia.org
11 Mar HMS Bayano Sinking in World War I: The sinking of the HMS Bayano on March 11, 1915, by a German U-boat, resulted in the loss of 35 crew members during World War I. source: en.wikipedia.org
14 Mar SMS Dresden scuttled during World War I: The German light cruiser SMS Dresden was scuttled off the coast of Chile after being cornered by British warships, marking the end of the German East Asia Squadron. source: historyofwar.org
18 Mar Battle of Gallipoli: Major naval engagement: On March 18, 1915, during the Gallipoli Campaign, Allied forces launched a major naval assault on the Dardanelles Strait. The operation aimed to secure a sea route to Russia and capture Istanbul. However, the attack was repelled by Ottoman forces, resulting in the sinking of three Allied battleships and marking a significant setback for the Allies. source: anews.com.tr
23 Mar Battle of Hartmannswillerkopf: Intense Alpine Warfare: On March 23, 1915, German forces launched a counterattack at Hartmannswillerkopf, a strategic peak in the Vosges Mountains. Despite initial gains, the French held their positions, leading to a prolonged and grueling battle characterized by harsh conditions and heavy casualties. source: hellfirecorner.co.uk
26 Mar Battle of Hartmannswillerkopf: On March 26, 1915, French forces launched a successful assault on the summit of Hartmannswillerkopf, capturing the peak after intense fighting. This victory was a significant step in the French campaign to secure the Vosges region during World War I. source: hellfirecorner.co.uk
27 Mar Gallipoli Campaign preparations: On March 27, 1915, preparations for the Gallipoli Campaign were underway as Allied forces planned to launch an attack on the Ottoman Empire during World War I. This campaign aimed to secure a sea route to Russia and was marked by significant military strategy and logistics. source: britannica.com
28 Mar Sinking of British ocean liner Falaba: The British ocean liner Falaba was sunk by a German U-boat on March 28, 1915, resulting in the loss of 104 lives. This incident heightened tensions between Germany and the United Kingdom during World War I, contributing to the narrative of unrestricted submarine warfare. source: britannica.com
30 Mar Launch of HMS Foxglove, Royal Navy minesweeper: HMS Foxglove, a Royal Navy minesweeper, was launched on March 30, 1915. This vessel was part of the Royal Navy's efforts to secure shipping lanes during World War I, reflecting the increasing importance of naval operations in the conflict. source: naval-history.net
02 Apr French Parliament creates Croix de Guerre military decoration: On April 2, 1915, the French Parliament established the Croix de Guerre, a military honor awarded to soldiers for acts of heroism in combat. The decoration became a significant symbol of bravery and distinction during World War I. source: en.wikipedia.org
06 Apr Battle of Celaya: Decisive Mexican Revolutionary Conflict: The Battle of Celaya, fought from April 6 to 15, 1915, was a pivotal engagement during the Mexican Revolution. The Constitutionalist forces under General Álvaro Obregón faced off against Pancho Villa's División del Norte. The first battle occurred on April 6–7, resulting in a significant defeat for Villa's forces. This loss marked a turning point in the revolution, leading to the eventual decline of Villa's military power. source: en.wikipedia.org
13 Apr Battle of Shaiba: British Forces Repel Ottoman Attack: On April 13, 1915, during the Mesopotamian campaign of World War I, British forces successfully repelled an Ottoman attack at Shaiba, near Basra. This engagement was part of the broader conflict between British and Ottoman forces in the region. source: en.wikipedia.org
14 Apr Battle of Shaiba: British Forces Corner Ottoman Troops: On April 14, 1915, British forces achieved a significant victory at the Battle of Shaiba, cornering and defeating Ottoman troops. This battle was a pivotal moment in the Mesopotamian campaign during World War I. source: en.wikipedia.org
15 Apr Battle of Celaya - Mexican Revolution Turning Point: On April 15, 1915, the Battle of Celaya occurred during the Mexican Revolution. This battle was a significant turning point, with revolutionary forces achieving a decisive victory over the federal army. source: en.wikipedia.org
17 Apr Battle of Hill 60 during World War I: The Battle of Hill 60 took place on April 17, 1915, as part of the larger Ypres Salient campaign in World War I. This battle was characterized by intense fighting and the use of new military tactics, including the deployment of gas. It was a significant engagement for both British and German forces. source: britannica.com
18 Apr Battle of Hill 60 - World War I tactical engagement: On April 18, 1915, the tactical engagement at Hill 60 continued, with both sides vying for control. The battle was marked by the use of trench warfare and significant casualties. It highlighted the brutal nature of World War I combat. source: britannica.com
19 Apr Battle of Hartmannswillerkopf during World War I: The Battle of Hartmannswillerkopf began on April 19, 1915, as part of the larger conflict in the Vosges Mountains. This battle was characterized by difficult terrain and fierce fighting between French and German forces, resulting in heavy casualties. source: britannica.com
21 Apr German-led expedition against Assyrians: On April 21, 1915, a German-led expedition was launched against Assyrian communities in the Ottoman Empire. This operation was part of the broader context of World War I and the ethnic conflicts occurring during that period. source: britannica.com
22 Apr Detailed account of chemical warfare at Ypres: The German Army's use of chlorine gas during the Second Battle of Ypres on April 22, 1915, marked the first large-scale deployment of poison gas in World War I, causing panic and numerous casualties among Allied troops. source: history.com
23 Apr Gallipoli Campaign: Allied landings begin: The Gallipoli Campaign began on April 23, 1915, with Allied forces landing on the Gallipoli Peninsula in an attempt to secure a sea route to Russia during World War I. source: britannica.com
24 Apr Chemical warfare in World War I: Chemical warfare became a significant aspect of World War I, with the first large-scale use of poison gas occurring during the Second Battle of Ypres on April 22, 1915. source: history.com
25 Apr Gallipoli Campaign invasion begins: On April 25, 1915, Allied forces, including Australian and New Zealand troops, initiated the Gallipoli Campaign by landing on the peninsula in Turkey. The objective was to secure a sea route to Russia, but the campaign resulted in heavy casualties and a stalemate. source: anzacportal.dva.gov.au
26 Apr Italy joins the Allies in World War I via Treaty of London: On April 26, 1915, Italy signed the Treaty of London, officially entering World War I on the side of the Allies. The treaty promised Italy territorial gains in exchange for its support against the Central Powers. source: en.wikipedia.org
27 Apr Battle of Krithia during Gallipoli Campaign: The Battle of Krithia, part of the Gallipoli Campaign, took place on April 27, 1915. Allied forces attempted to advance inland but faced strong Ottoman resistance, resulting in heavy casualties and no significant territorial gains. source: anzacportal.dva.gov.au
28 Apr Battle of Shaiba during World War I: On April 28, 1915, the Battle of Shaiba occurred in Mesopotamia. British and Indian forces defeated Ottoman troops, securing the region and ensuring the safety of the oil fields, which were crucial for the Allies. source: en.wikipedia.org
29 Apr Battle of Gurin: British Colonial Troops Resist German Forces: The Battle of Gurin, fought on April 29, 1915, saw British colonial troops successfully resist German forces. This victory was significant in maintaining Allied control in the region. source: en.wikipedia.org
02 May Gorlice–Tarnów Offensive in World War I: The Gorlice–Tarnów Offensive, launched by the Central Powers on May 2, 1915, was a significant military campaign on the Eastern Front during World War I, resulting in the capture of large areas of Russian territory. source: en.wikipedia.org
04 May Italy abandons Triple Alliance: On May 4, 1915, Italy declared its neutrality in World War I, effectively abandoning the Triple Alliance with Germany and Austria-Hungary. source: en.wikipedia.org
05 May Gorlice–Tarnów Offensive: Major Russian Army collapse: On May 5, 1915, the Gorlice–Tarnów Offensive commenced, leading to a significant collapse of the Russian Army on the Eastern Front. This offensive was a pivotal moment in World War I, resulting in substantial territorial gains for the Central Powers. The Russian forces faced severe losses and were forced to retreat. source: britannica.com
06 May Second Battle of Krithia in Gallipoli Campaign: The Second Battle of Krithia took place on May 6, 1915, during the Gallipoli Campaign. Allied forces aimed to capture the village of Krithia but faced fierce resistance from Ottoman troops. The battle resulted in heavy casualties and demonstrated the challenges of the campaign. source: britannica.com
07 May Sinking of the RMS Lusitania: On May 7, 1915, the RMS Lusitania was sunk by a German U-boat off the coast of Ireland, resulting in the deaths of 1,198 passengers and crew. This event had significant political ramifications, influencing public opinion in the United States and contributing to the country's eventual entry into World War I. source: britannica.com
09 May Second Battle of Artois in World War I: The Second Battle of Artois commenced on May 9, 1915, as part of the larger campaign on the Western Front during World War I. This battle involved significant fighting between Allied and German forces, contributing to the ongoing stalemate of trench warfare. source: britannica.com
10 May Second Battle of Artois: During World War I, the French launched a strategic feint attack to divert enemy attention while simultaneously repositioning new cavalry divisions to support the Tenth Army's military operations.
15 May Costly British Offensive in Artois During World War I: On May 15, 1915, British forces launched the Battle of Festubert in the Artois region of France, part of the Second Battle of Artois. Despite a continuous three-day bombardment, the offensive resulted in approximately 16,648 British casualties and minimal territorial gains, marking it as a costly endeavor. source: en.wikipedia.org
16 May Battle of Hill 60: Gas Warfare Tactics: On May 16, 1915, during the Second Battle of Ypres, the Battle of Hill 60 saw the first large-scale use of poison gas by the British on the Western Front. The attack aimed to capture the strategically important Hill 60, but despite initial successes, the offensive ultimately failed to achieve its objectives. source: en.wikipedia.org
18 May Battle of Festubert: Canadian Division's World War I Offensive: On May 18, 1915, the Canadian Division participated in the Battle of Festubert, a British offensive in the Artois region of France. The Canadians faced heavy casualties and challenging conditions, contributing to the overall British effort on the Western Front. source: en.wikipedia.org
21 May Second Battle of Artois: French Resistance Under German Assault: On May 21, 1915, during the Second Battle of Artois, French forces faced a significant German assault. Despite the pressure, the French troops demonstrated resilience in defending their positions.
25 May Second Battle of Ypres concludes with massive casualties: The Second Battle of Ypres, fought from April 22 to May 25, 1915, ended with significant losses on both sides. The Allies suffered approximately 59,000 casualties, while German forces incurred around 35,000. The battle was notable for the first large-scale use of poison gas by the Germans. source: britannica.com
04 Jun Third Battle of Krithia during Gallipoli Campaign: The Third Battle of Krithia took place on June 4, 1915, during the Gallipoli Campaign. Allied forces launched an attack against Ottoman defenses at Krithia, aiming to advance their position. The assault was repelled, resulting in significant casualties on both sides and marking the end of the possibility for a decisive breakthrough. source: en.wikipedia.org
08 Jun Battle of Hébuterne during World War I: The Battle of Hébuterne occurred from June 7 to 13, 1915, as part of the Second Battle of Artois on the Western Front. The French Second Army, led by General Noël de Castelnau, attacked German positions near the village of Hébuterne in Picardy, France. The battle resulted in significant casualties on both sides, with the French suffering approximately 10,351 casualties, including 1,760 killed or missing and 8,590 wounded. The Germans had around 1,200 killed and 651–1,016 prisoners of war. The battle concluded without a decisive outcome, with both sides holding their positions. source: en.wikipedia.org
09 Jun William Jennings Bryan Resigns as Secretary of State: On June 9, 1915, U.S. Secretary of State William Jennings Bryan resigned due to disagreements with President Woodrow Wilson over the handling of the crisis following the sinking of the British passenger liner Lusitania by a German submarine. Bryan's resignation was a response to Wilson's firm stance against Germany, which he feared could lead the United States into World War I. source: history.com
10 Jun British and French Forces Conquer Cameroon: On June 10, 1915, British and French forces successfully captured German-controlled Cameroon during World War I. This operation was part of the broader Allied efforts to seize German colonies in Africa, aiming to disrupt German supply lines and resources. The conquest of Cameroon marked a significant strategic victory for the Allies in the African theater. source: en.wikipedia.org
11 Jun Second Battle of Artois during World War I: The Second Battle of Artois took place from May 9 to June 18, 1915, on the Western Front during World War I. The French Second Army, under General Noël de Castelnau, conducted attacks against German positions in the Artois region of northern France. The battle aimed to relieve pressure on the French Tenth Army and to hinder German movements. Despite initial successes, the battle concluded without a decisive breakthrough, with both sides suffering significant casualties. source: en.wikipedia.org
12 Jun Austro-German Offensive Resumes in Galicia: On June 12, 1915, during World War I, the Austro-German offensive in Galicia resumed. This offensive aimed to push back Russian forces and was part of the broader Central Powers' strategy on the Eastern Front. source: en.wikipedia.org
14 Jun Second Battle of Artois: French Offensive in World War I: On June 14, 1915, during the Second Battle of Artois, French forces launched an offensive against German positions. Despite initial advances, the French encountered strong German defenses, including newly constructed barbed wire, which hindered their progress. source: en.wikipedia.org
16 Jun Second Battle of Artois during World War I: The Second Battle of Artois was fought between French and German forces during World War I. It was part of a series of offensives aimed at breaking the stalemate on the Western Front, resulting in significant casualties on both sides. source: britannica.com
17 Jun League to Enforce Peace established: The League to Enforce Peace was established in 1915 by a group of American leaders advocating for a new international organization to prevent future wars. This initiative laid the groundwork for later international cooperation efforts, including the League of Nations. source: archives.gov
18 Jun French offensive at Western Front: On June 18, 1915, French forces launched a significant offensive on the Western Front, aiming to break through German lines. This offensive was part of the ongoing struggle for control in World War I, resulting in heavy fighting and casualties. source: britannica.com
20 Jun German offensive in Argonne Forest during World War I: The German offensive in the Argonne Forest began on June 20, 1915, as part of their strategy to regain lost ground on the Western Front. This battle was characterized by intense trench warfare and significant casualties. source: britannica.com
27 Jun Dutch Social Democratic Workers' Party Protests Conscription: On June 27, 1915, the Dutch Social Democratic Workers' Party (SDAP) organized a significant demonstration in Amsterdam against military conscription. This event highlighted the party's opposition to the war and its commitment to workers' rights. source: giftpals.com
01 Jul Australian Survey Corps integrated into Australian Army: On July 1, 1915, the Australian Survey Corps was integrated into the Australian Army. This integration aimed to enhance the military's mapping and surveying capabilities, which were crucial for military operations during World War I. source: en.wikipedia.org
02 Jul British Parliament passes Munitions of War Act: The Munitions of War Act was passed by the British Parliament on July 2, 1915, to regulate the production and supply of munitions during World War I. This legislation aimed to ensure adequate supplies for the war effort. source: bbc.co.uk
05 Jul Battle of Gully Ravine during Gallipoli Campaign: The Battle of Gully Ravine took place on July 5, 1915, as part of the Gallipoli Campaign in World War I. This battle was marked by heavy casualties and strategic challenges for the Allied forces. source: britannica.com
06 Jul Oswald Boelcke's first aerial victory in World War I: On July 6, 1915, German pilot Oswald Boelcke achieved his first aerial victory during World War I. He became one of the war's most celebrated fighter aces, known for his tactical innovations in aerial combat. source: britannica.com
10 Jul Battle of Manzikert (Malazgirt) in World War I: The Battle of Manzikert, also known as the Battle of Malazgirt, occurred from July 10 to 26, 1915, during the Caucasus Campaign of World War I. Russian forces launched an offensive to capture the hills west of Malazgirt but faced a counterattack by Ottoman forces, leading to a retreat by the Russians and the recapture of Malazgirt by the Ottomans. source: en.wikipedia.org
17 Jul Second Battle of Isonzo begins: The Second Battle of Isonzo commenced on July 17, 1915, between Italian and Austro-Hungarian forces during World War I. source: en.wikipedia.org
18 Jul Second Battle of Isonzo during World War I: The Second Battle of Isonzo, part of World War I, took place between Italian and Austro-Hungarian forces starting on July 18, 1915. source: en.wikipedia.org
20 Jul Battle of Manzikert: Ottoman-Russian Conflict: Between July 10 and 26, 1915, the Battle of Manzikert occurred during World War I. On July 20, Ottoman forces retook the town of Malazgirt from Russian control. The battle resulted in significant casualties on both sides, with the Russians retreating from the region. source: en.wikipedia.org
03 Aug British submarines raid Constantinople Harbour: On August 3, 1915, British submarines conducted a daring raid on Constantinople Harbour (now Istanbul), targeting the Ottoman Empire's naval assets during World War I. source: en.wikipedia.org
04 Aug HMS C33 submarine tragedy in North Sea: On August 4, 1915, the British submarine HMS C33 was lost in the North Sea, with all 27 crew members perishing, marking one of the early submarine tragedies of World War I. source: en.wikipedia.org
05 Aug German occupation of Warsaw: On August 5, 1915, German forces captured Warsaw, the capital of Poland, during World War I, marking a significant shift in the Eastern Front. source: en.wikipedia.org
06 Aug Battle of Lone Pine at Gallipoli: On August 6, 1915, the Battle of Lone Pine commenced at Gallipoli, a significant engagement between Australian and Turkish forces during World War I. source: en.wikipedia.org
07 Aug Battle of the Nek: A Tragic Australian Light Horse Assault: On August 7, 1915, during the Gallipoli campaign, the Australian 3rd Light Horse Brigade launched a disastrous assault at the Nek, a narrow ridge connecting Russell's Top and Baby 700. The attack, intended as a feint to support New Zealand troops at Chunuk Bair, resulted in 372 casualties, including 234 killed, with minimal Ottoman losses. source: en.wikipedia.org
08 Aug British Submarine Sinks Turkish Battleship in Dardanelles: On August 8, 1915, during the Gallipoli campaign, a British submarine successfully sank a Turkish battleship in the Dardanelles Strait, contributing to the Allied naval blockade. source: en.wikipedia.org
10 Aug Battle of Lone Pine during Gallipoli Campaign: The Battle of Lone Pine, a significant engagement during the Gallipoli campaign, concluded on August 10, 1915. The battle resulted in heavy casualties on both sides, with the Anzac forces eventually gaining control of the position. source: en.wikipedia.org
13 Aug Sinking of the Royal Edward in World War I: On August 13, 1915, the British troopship Royal Edward was torpedoed and sunk by the German submarine UB-14 in the Aegean Sea. The ship was carrying reinforcements for the Gallipoli campaign, including members of the Royal Army Medical Corps. The attack resulted in a significant loss of life, with over 900 individuals perishing, as the ship sank within six minutes. source: en.wikipedia.org
14 Aug Battle of the Frontiers Begins: The Battle of the Frontiers commenced on August 14, 1915, during World War I. This series of engagements involved French and German forces along the Western Front. The battles aimed to break the stalemate and achieve a decisive victory, but they resulted in heavy casualties without significant territorial changes. source: en.wikipedia.org
05 Sep Zimmerwald Anti-War Conference: The Zimmerwald Conference, held from September 5 to 8, 1915, in Zimmerwald, Switzerland, was the first of three international conferences convened by anti-militarist socialists in response to World War I. A total of 42 individuals and 11 organizations participated, issuing a manifesto denouncing the war and calling for working-class unity. source: en.wikipedia.org
24 Sep World War I: Ongoing Global Conflict: By September 1915, World War I had expanded beyond Europe, involving numerous nations across multiple continents. The conflict had become a global war, with significant battles on the Western and Eastern Fronts, as well as in the Middle East and Africa. Major powers such as the United Kingdom, France, Germany, Austria-Hungary, the Ottoman Empire, and Italy were deeply engaged in various theaters of war. source: britannica.com
25 Sep Battle of Loos: British Offensive in World War I: On September 25, 1915, the British launched the Battle of Loos, part of the Third Battle of Artois. This was the largest British offensive of the year, involving six divisions and the first use of gas as a weapon. The attack aimed to break through the German lines at Loos, but despite initial gains, the offensive resulted in heavy British casualties and limited success. source: en.wikipedia.org
26 Sep Sir A. J. Murray Appointed Chief of the Imperial General Staff: On September 26, 1915, Sir Archibald James Murray was appointed Chief of the Imperial General Staff (CIGS) of the British Army. He succeeded Sir John French, who had been criticized for the failure of the Gallipoli Campaign. Murray's appointment aimed to bring fresh leadership to the British military during World War I. source: en.wikipedia.org
28 Sep Italy Enters World War I: On September 28, 1915, Italy declared war on Austria-Hungary, entering World War I on the side of the Allies. Italy's decision was influenced by promises of territorial gains and the desire to assert its influence in Europe. Italy's entry into the war opened up a new front in the Alps and along the Isonzo River. source: britannica.com
06 Oct Entente Forces Land in Thessaloniki: On October 6, 1915, Entente forces, including French and British troops, landed in Thessaloniki, Greece, to establish a base of operations during World War I. This strategic move aimed to support Serbian forces and counter the Central Powers' advances in the Balkans. source: en.wikipedia.org
11 Oct Royal Flying Corps Establishes No. 31 Squadron: On October 11, 1915, the Royal Flying Corps established No. 31 Squadron, which played a significant role in reconnaissance and bombing missions during World War I. The squadron's operations contributed to the Allied efforts on the Western Front. source: en.wikipedia.org
13 Oct Battle of the Hohenzollern Redoubt Concludes: The Battle of the Hohenzollern Redoubt, part of the larger Battle of Loos, concluded on October 13, 1915, with British forces failing to capture the German stronghold. source: Wikipedia (day-month pages)
14 Oct Bulgaria enters World War I on Central Powers side: On October 14, 1915, Bulgaria declared war on Serbia, officially entering World War I on the side of the Central Powers. This decision was influenced by Bulgaria's territorial ambitions in the Balkans and its desire to regain lands lost during the Balkan Wars. source: britannica.com
15 Oct Invasion of Serbia during World War I: Following Bulgaria's declaration of war on October 14, 1915, Bulgarian forces, along with German and Austro-Hungarian troops, launched an invasion of Serbia. The operation aimed to capture strategic locations and cut off Serbian supply lines, leading to the occupation of significant Serbian territories. source: en.wikipedia.org
16 Oct Great Britain Declares War on Bulgaria: On October 16, 1915, Great Britain declared war on Bulgaria in response to Bulgaria's recent entry into World War I on the side of the Central Powers. This declaration marked an escalation of the conflict in the Balkans. source: en.wikipedia.org
18 Oct Third Battle of the Isonzo: The Third Battle of the Isonzo, also known as the Battle of the Three Kings, was fought between Italian and Austro-Hungarian forces from October 18 to November 4, 1915. The battle aimed to break through Austro-Hungarian defenses along the Isonzo River in present-day Slovenia. source: en.wikipedia.org
04 Nov Third Battle of Artois ends in failure: The Third Battle of Artois, part of the Loos–Artois Offensive, concluded on November 4, 1915, with the Allied forces failing to break through German defenses. The French suffered approximately 48,320 casualties, while the British incurred around 61,713. German casualties were about 51,100, including 2,000 prisoners of war. source: en.wikipedia.org
06 Nov Battle of Banjo: British Capture German Fort: Between November 4 and 6, 1915, British forces besieged German forces entrenched on Banjo mountain during the Kamerun campaign of World War I. By November 6, most of the German garrison had deserted, and the remaining forces surrendered, leading to a British victory. source: en.wikipedia.org
08 Nov Launch of HMAS Geranium: On November 8, 1915, the Royal Australian Navy launched HMAS Geranium, a Flower-class corvette. The ship was commissioned into the Royal Australian Navy and served during World War II. source: en.wikipedia.org
09 Nov Morava Offensive: Bulgarian invasion of Serbia: On November 9, 1915, during World War I, the Bulgarian army launched the Morava Offensive, invading Serbia. This operation was part of the Central Powers' efforts to secure the Balkans. source: en.wikipedia.org
10 Nov Lord Kitchener travels to Gallipoli: On November 10, 1915, British Secretary of State for War, Lord Kitchener, visited the Gallipoli campaign during World War I to assess the situation firsthand. source: en.wikipedia.org
11 Nov French military convoy attacked during Zaian War: On November 11, 1915, during the Zaian War in Morocco, a French military convoy was attacked. The Zaian War was a conflict between French forces and the Zaian Berber tribes. source: en.wikipedia.org
24 Nov Serbian Leadership Exodus During World War I: On November 24, 1915, the Serbian High Command, led by General Radomir Putnik, ordered a retreat across the mountains of Montenegro and Albania to escape encirclement by Central Powers forces. This strategic withdrawal aimed to reach the Adriatic coast, where the Serbian Army could reorganize and receive Allied assistance. The journey was perilous, with thousands perishing due to harsh conditions and enemy attacks. source: en.wikipedia.org
25 Nov Serbian Military Retreat in World War I: On November 25, 1915, the Serbian military initiated a retreat across the mountains of Montenegro and Albania to evade encirclement by Central Powers forces. This strategic withdrawal aimed to reach the Adriatic coast, where the Serbian Army could regroup and receive Allied support. The journey was arduous, with many soldiers and civilians succumbing to harsh conditions and enemy attacks. source: en.wikipedia.org
26 Nov Gallipoli Campaign: Severe Weather Impact: On November 26, 1915, severe weather conditions significantly impacted the Gallipoli Campaign during World War I. The harsh weather affected both Allied and Ottoman forces, leading to logistical challenges and increased casualties. The adverse conditions underscored the difficulties of conducting military operations in the region. source: en.wikipedia.org
27 Nov Devastating Winter Storm at Gallipoli During World War I: On November 27, 1915, a severe winter storm struck the Gallipoli Peninsula during World War I, exacerbating the hardships faced by Allied forces. The storm led to increased casualties, disrupted supply lines, and further complicated the already challenging conditions of the campaign. source: en.wikipedia.org
06 Dec Henry Ford's Peace Ship Expedition: On December 4, 1915, Henry Ford's 'Peace Ship' expedition set sail from Hoboken, New Jersey, aiming to mediate an end to World War I. The ship, Oscar II, carried a group of peace activists to Europe. However, the mission faced internal conflicts and media mockery, leading to its abandonment by December 23, 1915. source: thehenryford.org
08 Dec Battle of Kosturino: On December 8, 1915, the Battle of Kosturino occurred during World War I, involving French and Serbian forces against the Bulgarian army in the Salonika Front. source: en.wikipedia.org
09 Dec Battle of Kosturino: French Resistance Against Bulgarian Army: On December 9, 1915, French forces continued to resist the Bulgarian army in the Battle of Kosturino, part of the larger conflict on the Salonika Front during World War I. source: en.wikipedia.org
10 Dec Russian naval engagement in Black Sea: On December 10, 1915, a naval engagement occurred in the Black Sea involving Russian forces. This engagement was part of the broader naval operations during World War I, where the Russian Navy sought to assert control over the Black Sea against the Ottoman Empire. source: britannica.com
11 Dec Field Marshall John French appointed command-in-chief of home forces: On December 11, 1915, Field Marshall John French was appointed as the command-in-chief of the British home forces. This appointment came during a critical period of World War I, as Britain sought to strengthen its military leadership at home. source: britannica.com
12 Dec Russian Troops Advance in Persia: Russian military forces overrun the city of Hamadan in Persia (modern-day Iran) during World War I, demonstrating the complex geopolitical dynamics of the conflict.
26 Dec British capture German warship in Lake Tanganyika: On December 26, 1915, British forces captured the German warship SMS Seeadler in Lake Tanganyika during World War I. This event was significant in the naval operations in East Africa. source: britannica.com

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