1915

January

19- First Zeppelin raid on Britain
23- German and Austrian offensive in the Carpathians
24- Battle of the Dogger Bank

February

4- German submarine warfare against merchant vessels begins
7-21- Winter Battle of the Masurian Lakes
19- British bombard Turkish forts in the Dardenelles

March

10-14- Battle of Neuve Chapelle
22- Przemsyl surrenders to Russians

April

22-5/25/15- Second battle of Ypres (first succesful use of poison gas on a large scale, 4/22/15)
25- Allies land in Gallipoli, Treaty of London

May

2-6/27/15- German breakthrough at Gorlice-Tarnow
7- Lusitania sunk by German U-boat
9-6/30/15 - Second Battle of Artois
23- Italy enters war on Allied side

June

22- Lemberg recaptured by Central Powers
23- Italy begins operations on the Isonzo Front

July

9- German forces in South-West Africa surrender

August

5- Germans capture Warsaw from the Russians
6-21- Second Allied landings at Gallipoli fail
21- Italy declares war on Turkey
25- Germans capture Brest-Litovsk

September

1- Germany ends unlimited submarine warfare
25-11/6/15 - Allied offensives at Loos and in Champagne
28- Allied troops enter Kut

October

6- Serbia invaded by Germany, Austria and Bulgaria
9- Allied troops arrive at Salonika
15- Britain declares war on Bulgaria
23- Allied evacuation of Gallipoli approved

November

27- Serbian army collapses and is evacuated to Corfu

December

3- Joffre becomes French commander-in-chief
7- Siege of Kut begins
17- Haig replaces French as British commander-in-chief in France