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January 1 - March 30
Allied offensive in Artois and Champagne -
January 15
Japan's 21 demands on China -
January 19-20
First German zeppelin attack on England -
February 4
German U-boat attacks on Allied and neutral shipping; declares blockade of Britain -
February 7-21
Russians suffer heavy losses at Second Battle of Masurian Lakes (also known as the Winter Battle) -
February 19-August
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 -
March 1
First passenger ship sinks, the British liner Falaba -
March 11
Britain announces blockade of German ports -
February - April
Austro-Hungarian attack on Russian Poland (Galicia) collapses, with the Russians counterattacking -
April-June
Germans focus on Eastern Front, breaking through Gorlice-Tarnow and forcing Russia out of much of Poland -
April 22 - May 25
First use of poison gas by Germany starts Second Battle of Ypres -
April 25
Allied landing at Gallipoli -
April 26
France, Russia, Italy and Britain conclude secret Treaty of London -
May 2
Austro-German offensive on Galicia begins -
May 7
U-boat sinks British liner Lusitania with the loss of American lives, creating a US-German diplomatic crisis -
May 9
Second Battle of Artois begins -
May 23
Ignoring treaty agreements with the Central Powers, Italy declares war on Austria-Hungary -
May 25
British Prime Minister Asquith reorganises his Liberal government as a coalition of the parties -
June 29 - December 2
Italians launch unsuccessful attack on Hungarians at 1st, 2nd, 3rd & 4th Battles of Isonzo; there are to be 12 in total -
August 4
Germans capture Warsaw -
September 5
Tsar Nicholas takes command of Russian armies -
September 22
Second Battle of Champagne begins -
October 3
Anglo-French force lands at Salonika in Greece -
October - November
austro-German-Bulgarian forces invade Serbia, expelling Serbian army from the country -
December 19
Sir Douglas Haig replaces Sir John French as commander of British Expeditionary Force -
December 28
Allies begin withdrawal of troops from Gallipoli