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Battle of Sarikamis
The Battle of Sarikamis was the first and largest battle of the WWI Caucasus Campaign, in which the troops of the Russian Empire were victorious over the troops of the Ottoman Empire. -
Japan makes twenty-one demands on China
The Twenty-One Demands were a set of impositions made by the Empire of Japan during the government of Prime Minister Okuma Shigenobu, presented to the nominal Government of the Republic of China on January 18. -
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Battle of Jassin
The Battle of Jassin took place on January 18 and 19, 1915 at Jassin, on the eastern side of German Africa on the border with British Africa. He faced a German Schutztruppe force and British and Indian troops. Jassin had been occupied by the British in order to secure the border between British East Africa and German territory, but was weakly defended by four companies of soldiers. -
Battle of Dogger Bank
The Battle of Dogger Bank was a naval warfare between the navies of the United Kingdom and the German Empire. It took place near the Dogger Bank, in the North Sea, on January 24, with the British Royal Navy tactically winning. -
Battle of Bolimov
The Battle of Bolimov took place on January 31 near the village of Bolimov in central Poland. The German Empire was pitted against the Russian Empire. -
Germany declares war zone in British waters
On February 4, Admiral Hugo von Pohl, commander of the German High Seas Fleet, published a notice in the Deutscher Reichsanzeiger (Imperial German Gazette):
The waters around Great Britain and Ireland are declared a war zones. -
Start of the submarine war
From February 18 onwards, all enemy merchant ships that are in this zone will be destroyed without distinction of the flag that it carries or its passengers.
The German submarine force was mainly anchored in Ostend, Belgium, giving the submarines better access to the shipping lanes around England. The Germans made use of this advantage and with 20 submarines began the naval blockade. -
Beginning of the battle of Gallipoli
The Battle of Gallipoli was a series of military campaigns fought on the Gallipoli Peninsula of Turkey. The English Empire, France, Australia and New Zealand faced the Ottoman Empire and the German Empire. The objective was to occupy Gallipoli to gain control of the strait Bbetween the Aegean Sea and the Marmara Sea. The battle lasted 10 months and 18 days, and ended in victory for the Ottoman Empire by preventing the Triple Entente from taking the peninsula. -
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Siege of Van
The siege of Van was an act of armed insurgency against the attempts of the Ottoman Empire to massacre the Armenian population of the Vilayate of Van, one of the few cases during the Armenian genocide where the Armenians were able to fight against the armed forces of the Ottoman Empire. -
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Second Battle of Ypres
The Second Battle of Ypres took place between April 22 and May 25, 1915, pitting France, the United Kingdom, Australia, and Canada against the German Empire. It was the first battle in which deadly gas was successfully used for military purposes. German forces fired asphyxiating chlorine gas at Allied troops, killing tens of thousands of Allied soldiers. However, it took the Germans several days to learn the result, enough time for the Allies to rearm the area. -
Treaty of London
The Treaty of London was signed on April 26, 1915. By it, Italy entered WWI on the side of the Triple Entente. The treaty was secret and the signatory countries were: The Kingdom of Italy, the United Kingdom of Great Britain and Ireland, France and the Russian Empire.
Under the treaty, Italy would receive Italian-inhabited areas in the Austro-Hungarian Empire, much of the Dalmatian coast, the Kingdom of Serbia, the Kingdom of Montenegro and Croatia. -
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Gorlice-Tarnów Offensive
The Gorlice-Tarnów Offensive began as a minor German offensive to relieve Russian pressure on Austria-Hungary, but resulted in the complete collapse of the Russian lines and their withdrawal into Russia. -
Sinking of the RMS Lusitania
The sinking of the RMS Lusitania, which occurred off the coast of Ireland on May 7 due to an attack by a German submarine, was one of the largest naval disasters to occur to a ship of the line during WWI. -
Italy declares war on Austria-Hungary
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Sino-Japanese treaty
On May 25, China and Japan signed an agreement whereby China finally accepted the "unequal treaty" that Japan had imposed on it. Great Britain and the United States were concerned to read between the lines of Japan's claim to establish a protectorate over all of China. -
Beginning of the Isonzo battles
The so-called battles of the Isonzo were a series of battles fought between the armies of the Empire of Austria-Hungary and the Kingdom of Italy. They took as their setting the area around the Isonzo River on the eastern border of Italy between June 1915 and November 1917. -
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First Battle of the Isonzo
The First Battle of the Isonzo was a battle fought between the Italians and the Austro-Hungarians between June 23 and July 7, 1915, and was one of the twelve battles of the Isonzo. -
South West Africa Campaign
The South West Africa Campaign was the conquest and occupation of German South West Africa by Union South African forces acting on behalf of the British Imperial Government. -
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Battle of Malazgirt
The Battle of Malazgirt was a battle in the Caucasian Campaign of World War I, which took place from July 10 to 26, 1915. Although losses were heavy on both sides, the Russians withdrew north and the Turks returned to take Malazgirt and then advanced further towards Karakilise, where they were defeated. -
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Second battle of the Isonzo
The second battle of the Isonzo was fought shortly after the conclusion of the first, in July 1915, with the same objective as this one: to break the Austro-Hungarian lines along the Isonzo river, to conquer Gorizia and Trieste and to allow the Italian advance towards Ljubljana. -
The German-Austro-Hungarians conquer Warsaw
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German-Austro-Hungarians conquer Kaunas Fortress
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German-Austro-Hungarians conquer Brest-Litovsk
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Bulgaria agrees with Germany to enter the war
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German-Austro-Hungarians conquer Vilnius
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Start of the Serbian campaign
The Serbian campaign of 1915 consisted of the invasion of Serbia by the armies of the Central Powers, carried out under the command of the German General August von Mackensen. -
Bulgaria declares war on Serbia and gets Macedonia
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Third battle of the Isonzo
The third battle of the Isonzo took place from October 18 to November 3 and had as its objective the Italian capture of Gorizia, after the failure of the two previous battles. -
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Battle of Krivola
The Battle of Krivolak was one of the first battles on the Macedonian front.
On October 21, Bulgarian units attacked the French positions near the Strumica railway station, sparking the battle. Fighting continued until the 22nd of the following month, when two Serbian divisions failed to recapture Skopje, preventing the Allies from continuing their offensives and allowing the French to withdraw from the region. -
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Fourth battle of the Isonzo
The fourth battle of the Isonzo was fundamentally a repetition of the third and was based on the conviction of the Italian chief of staff that one last push would break the weakened enemy lines and allow the conquest of the city of Gorizia, the objective of the previous battles. -
Great Withdrawal
The Great Withdrawal was a strategic withdrawal of the Royal Serbian Army, which marked the end of the second Serbian campaign. -
Capture of the Presidente Miter
The capture of the Presidente Miter ship while it was making a cabotage trip in the South Atlantic towards the Patagonian port of San Antonio, was carried out on November 28, 1915 by the British warship RMS Orama and caused a diplomatic incident between the two countries. involved that ended when the ship and its cargo were returned a few months later. -
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Chantilly conference
The Chantilly conference was an official meeting between representatives of the Allies whose purpose was to set a new course for WWI operations. The military who attended on behalf of their respective governments tried to plan coordinated military operations on all fronts. It was held at the headquarters of the General Headquarters in Chantilly on December 6, 7 and 8, 1915 and was attended by representatives of all the belligerent countries of the Allied side. -
Start of the siege of Kut
The siege of Kut was a siege of the homonymous Iraqi population, occupied by British troops, which ended with their capitulation to the Ottoman besiegers in 1916.
