January February March April May June July August September October November December
19 First Zeppelin raids on England
24 Battle of Dogger Bank
31 Battle of Bolimov starts (ends 2 Feb): first small-scale use of poison gas in battle
7-22 2nd Battle of Masurian Lakes (the 'Winter Battle')
19 First naval bombardment of the Dardanelles by Anglo-French forces
25 Second naval bombardment of the Dardanelles by Anglo-French forces
10-13 Battle of Neuve Chapelle
18 Unsuccessful Allied naval attack on the Dardanelles
20 British promise Constantinople to Russia at the end of the war
22 Russians capture Przemysl
12-14 British capture Kurna
20 Beginning of Armenian 'revolt' in Van
22 2nd Battle of Ypres starts (ends 25 May): first large-scale use of poison gas in battle
25 First Allied landings on the Gallipoli peninsula
26 Italy signs the Treaty of London
2 Start of Austro-German Gorlice-Tarnow offensive
7 Sinking of the Lusitania
23 Italy declares war on Austria-Hungary
25 British war coalition formed under Asquith
31 First Zeppelin raid on London
1 Employment of first women in British munitions factories
3 Austro-German forces recapture Przemysl
5 Beginning of Arab revolt against the Turks

5 German capture of Warsaw
6 British landings at Suvla Bay
6-9 Anzac offensive at Lone Pine, Gallipoli
25 Austro-German capture of Brest-Litovsk
18-19 German capture of Vilna
23 Bulgaria joins the war on the side of the Central Powers
25 Battle of Loos starts (ends 8 Oct)
28 British capture of Kut
5 Anglo-French landing at Salonika
6 Austro-German invasion of Serbia
8-9 Austrian capture of Belgrade
11 Bulgarian invasion of Serbia
12 Execution of Edith Cavell
22-26 Battle of Ctesiphon
27 Founding of No-Conscription Fellowship
2 Central Powers occupy Serbia
7 Beginning of Turkish siege of besieged British troops at Kut
19 Haig replaces French as head of the BEF
19-20 Evacuation of Allied positions on Gallipoli at Anzac Cove and Suvla Bay