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Allied offensive in Artois and Champagne
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Japan's 21 demands on China
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First German zeppelin attack on England
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German U-boat attacks on Allied and neutral shipping; declares blockade of Britain
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Russians suffer heavy losses at Second Battle of Masurian Lakes (also known as the Winter Battle)
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Allied amphibious attack on the Dardanelles and Gallipoli (initiated by Winston Churchill, who resigns as a consequence) ends with the Turkish siege of the Allied forces
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First passenger ship sinks, the British liner Falaba
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Britain announces blockade of German ports
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Austro-Hungarian attack on Russian Poland (Galicia) collapses, with the Russians counterattacking
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Germans focus on Eastern Front, breaking through Gorlice-Tarnow and forcing Russia out of much of Poland
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First use of poison gas by Germany starts Second Battle of Ypres
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Allied landing at Gallipoli
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France, Russia, Italy and Britain conclude secret Treaty of London
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Austro-German offensive on Galicia begins
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U-boat sinks British liner Lusitania with the loss of American lives, creating a US-German diplomatic crisis
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Second Battle of Artois begins
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Ignoring treaty agreements with the Central Powers, Italy declares war on Austria-Hungary
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British Prime Minister Asquith reorganises his Liberal government as a coalition of the parties
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Italians launch unsuccessful attack on Hungarians at 1st, 2nd, 3rd & 4th Battles of Isonzo; there are to be 12 in total
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Germans capture Warsaw
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Tsar Nicholas takes command of Russian armies
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Second Battle of Champagne begins
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Anglo-French force lands at Salonika in Greece
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austro-German-Bulgarian forces invade Serbia, expelling Serbian army from the country
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Sir Douglas Haig replaces Sir John French as commander of British Expeditionary Force
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Allies begin withdrawal of troops from Gallipoli