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1915

Dates	Events
January 2	The Russian offensive in the Carpathians begins. It will continue until April 12.
January 18–19	Battle of Jassin.
January 19	First Zeppelin raid on Great Britain.
January 19-December 22	Battle of Hartmannswillerkopf, series of battles fought to control the peak.
January 24	Battle of Dogger Bank between squadrons of the British Grand Fleet and the German Hochseeflotte.
January 24-January 26	Chilembwe uprising led by John Chilembwe in Nyasaland.
January 28–February 3	The Ottomans fail to capture the Suez Canal.
January 31	Battle of Bolimov. First German use of chemical weapons.
February 4	Germany begins unrestricted submarine warfare against merchant vessels.
February 7–February 22	Second Battle of the Masurian Lakes. The Russian X Army is defeated.
February 19	British and French naval attack on the Dardanelles. The Gallipoli Campaign begins.
March 10–March 13	Battle of Neuve Chapelle. After an initial success, a British offensive is halted.
March 22	The Siege of Przemyśl ends. The Russians capture the fortress.
April 5-May 5	First Battle of Woevre.
April 12-April 14	Battle of Shaiba.
April 19-May 17	The Ottomans besiege the Armenian city of Van.
April 22–May 25	The Second Battle of Ypres, which ends in a stalemate. Germany first uses the poison gas.
April 22-April 23	Battle of Gravenstafel, First stage of the Second Battle of Ypres.
April 24-May 5	Battle of St Julien, part of the Second Battle of Ypres.
April 25	Allied forces land on Gallipoli, landing at Anzac Cove and Cape Helles.
April 25	London Pact between the Entente and Italy.
April 28	First Battle of Krithia. The Allied advance is repelled.
May 1	The Gorlice-Tarnów begins: the German troops under General Mackensen break through the Russian lines in Galicia.
May 1	Battle of Eski Hissarlik.
May 3	Troops withdraw from Anzac Cove.
May 6–May 8	Second Battle of Krithia. The Allied attempts at advancing are thwarted again.
May 7	The British liner Lusitania is sunk by a German U-boat.
May 8-May 13	Battle of Frezenberg Ridge, Part of the Second Battle of Ypres.
May 9-June 18	Second Battle of Artois.
May 9	Battle of Aubers Ridge, a phase of the Second Battle of Artois.
May 10	Troops from Hungary rout the Russians at Jarosław. Lviv is again in Austrian hands.
May 11	Armistice called at Gallipoli to bury the dead.
May 12	Windhoek, capital of German South-West Africa, is occupied by South African troops.
May 15-May 25	Battle of Festubert.
May 16-June 23	Battle of Konary.
May 23	Italy declares war on Austria-Hungary.
May 24-May 25	Battle of Bellewaarde, final phase of the Second Battle of Ypres.
June 4	Third Battle of Krithia. Yet another Allied failure.
June 4	The Russians leave Przemyśl.
June 10-June 26	Battle of Manzikert.
June 21-June 23	Battle of Bukoba.
June 22	Mackensen breaks again through the Russian lines in the Lviv area.
June 23–July 7	First Battle of the Isonzo.
June 27	The Austro-Hungarians re-enter Lviv.
June 28–July 5	The British win the Battle of Gully Ravine.
June–September	The Russian Great Retreat from Poland and Galicia.
July 9	The German forces in South-West Africa surrender.
July	Battle of Kara Killisse.
July 18–August 3	Second Battle of the Isonzo.
July 25	Italians capture Cappuccio Wood.
August 5	The Germans occupy Warsaw.
August 6-August 10	Battle of Lone Pine, part of the August Offensive.
August 6-August 13	Battle of Krithia Vineyard, part of the August Offensive.
August 6-August 15	Allies land at Suvla Bay, a phase of the August Offensive.
August 6–August 21	Battle of Sari Bair, part of the August Offensive. Last and unsuccessful attempt by the British to seize the Gallipoli peninsula.
August 7	Battle of the Nek, a phase of the August Offensive.
August 7-August 19	Battle of Chunuk Bair, a phase of the August Offensive.
August 21	Scimitar Hill, a phase of the August Offensive.
August 21-August 29	Battle of Hill 60, part of the August Offensive.
August 26-September 19	Sventiany Offensive, a phase of the Gorlice-Tarnow Offensive.
September 1	Germany suspends unrestricted submarine warfare.
September 8	Nicholas II removes Grand Duke Nicholas Nikolayevich as Commander-in-Chief of the Russian Army, personally taking that position.
September 15-November 4	Third Battle of Artois.
September 19	The Germans occupy Vilnius. The Gorlice-Tarnów Offensive ends.
September 25–September 28	Battle of Loos, a major British offensive, fails.
September 25-October 15	Battle of the Hohenzollern Redoubt, a phase of the Battle of Loos.
September 25-November 6	Second Battle of Champagne.
September 28	Battle of Es Sinn.
October 7-December 4	Serbia is invaded by Germany, Austria-Hungary, and Bulgaria.
October 14	Bulgaria declares war on Serbia
October 14-November 9	Morava Offensive, a phase of the Central Powers Invasion of Serbia, Bulgarians break through Serbian lines.
October 14-November 15	Ovche Pole Offensive, a phase of the Central Powers invasion of Serbia, Bulgarians break through Serbian lines.
October 15	The United Kingdom declares war on Bulgaria.
October 16	France declares war on Bulgaria.
October 17-November 21	Battle of Krivolak, start of the set up of the Salonika Front.
October 18–November 4	Third Battle of the Isonzo
October 19	Italy and Russia declare war on Bulgaria.
October 27	A French army lands in Salonika and, with the help of British and Italian troops, sets up a Balkan Front.
November 10–December 2	Fourth Battle of the Isonzo
November 10-December 4	Kosovo Offensive, a phase of the Central Powers invasion of Serbia, Serbians pushed into Albania.
November 22–November 25	Battle of Ctesiphon, in present-day Iraq.
November 27	The Serbian army collapses. It will retreat to the Adriatic Sea and be evacuated by the Italian and French Navies.
December–July, 1916	Battle of Lake Tanganyika.
December 6-December 12	Battle of Kosturino
December 7	The First Siege of Kut, Mesopotamia, by the Ottomans begins.
December 19	Douglas Haig replaces John French as commander of the British Expeditionary Force.