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Dates
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Events
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January 3-January 4
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Battle of Behobeho.
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January 9
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Battle of Rafa. The British drive the Ottomans out of Sinai.
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January 11-March 13
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British raid the Ancre.
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January 16
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The German Foreign Secretary Arthur Zimmermann sends a telegram to his ambassador in Mexico, instructing him to propose to the Mexican government an alliance against the United States.
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February 1
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Germany resumes unrestricted submarine warfare.
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February 23
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Second Battle of Kut. The British recapture the city.
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February 23–April 5
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The Germans withdraw to the Hindenburg Line.
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March 1
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Arz von Straussenberg replaces Conrad von Hötzendorf as Austro-Hungarian Chief of Staff.
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March 8–March 11
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The British capture Baghdad.
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March 13-April 23
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Samarrah Offensive, British capture much of Mesopotamia.
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March 15
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Russia: Czar Nicholas II abdicates. A provisional government is appointed.
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March 26
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First Battle of Gaza. The British attempt to capture the city fails.
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April–October
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Stalemate in Southern Palestine.
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April 2-April 3
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Australians attack Noreuil.
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April 6
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The United States of America declares war on Germany.
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April 9–May 17
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Second Battle of Arras. The British attack a heavily fortified German line without obtaining any strategic breakthrough.
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April 9–April 12
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The Canadians obtain a significant victory in the Battle of Vimy Ridge, part of the first phase of the Second Battle of Arras.
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April 9-April 14
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First Battle of the Scarpe, part of the first phase of the Second Battle of Arras.
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April 10-April 11
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First Battle of Bullecourt,part of the first phase of the Second Battle of Arras.
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April 15
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Battle of Lagnicourt, part of the Second phase of the Second Battle of Arras.
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April 16–May 9
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The Second Battle of the Aisne (aka Nivelle Offensive) ends in disaster for both the French army and its commander Robert Nivelle.
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April 17-April 20
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Battle of the Hills (aka Third battle of Champagne), a diversion to the Second Battle of the Aisne.
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April 19
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Second Battle of Gaza. The Ottoman lines resist a British attack.
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April 22-May 8
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Second Battle of Doiran.
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April 23-April 24
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Second Battle of Scarpe, part of the second phase of the Second Battle of Arras.
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April 28-April 29
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Battle of Arleux, part of the Second phase of the Second Battle of Arras.
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April 29–May 20
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Series of mutinies in the French army.
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May 3-May 4
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Third battle of the Scarpe, part of the second phase of the Second Battle of Arras.
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May 3-May 17
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Second Battle of Bullecourt, part of the second phase of the Second Battle of Arras.
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May 5–May 15
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Allied Spring offensive on the Salonika Front.
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May 5-May 9
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Second Battle of the Cerna Bend, a phase of the Allied Spring Offensive.
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May 12–June 6
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Tenth Battle of the Isonzo.
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May 15
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Philippe Pétain replaces Robert Nivelle as Commander-in-Chief of the French Army.
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May 23
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Battle of Mount Hermada in the Karst.
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June–October
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Operation Hush, British attempt to capture coast of Belgium fails.
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June 7–June 14
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Second Battle of Messines, The British recapture Messines Ridge.
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June 10–June 29
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Battle of Mount Ortigara.
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June 12
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Greece: King Constantine I abdicates.
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June 13
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First successful heavy bomber raid on London done by the Gotha G.IV.
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June 25
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First American troops land in France.
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June 30
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Greece declares war on the Central powers.
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July 1–July 19
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The Kerensky Offensive fails. It is the last Russian initiative in the war.
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July 1-July 2
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Battle of Zborov, a phase of the Kerensky Offensive.
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July 6
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Arab rebels led by Lawrence of Arabia seize the Jordanian port of Aqaba.
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July 20
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Corfu Declaration about the future Kingdom of Yugoslavia.
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July 22-August 1
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Battle of Marasti
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July 29
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Battle of Kiawe Bridge.
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July 31
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The Third Battle of Ypres (aka Battle of Passchendaele) begins.
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July 31-August 2
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Battle of Pilckem Ridge (Opening phase of the Third Battle of Ypres).
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August 2-August 10
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Battle of Rumbo.
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August 6–August 20
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Battle of Mărăşeşti.
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August 8-August 20
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Second Battle of Oituz.
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August 15-August 25
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Battle of Hill 70 (Initial phase of the Battle of Third Battle of Ypres).
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August 16-August 18
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Second Battle of Langemarck (Initial phase of the Battle of Third Battle of Ypres).
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August 18–August 28
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Eleventh Battle of the Isonzo.
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August 20-August 26
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Second Offensive Battle of Verdun.
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September–October
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Operation Albion. German capture of Oesel, Dago and Moon Islands.
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September 1-September 3
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Battle of Jugla.
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September 8
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Russia: General Kornilov's coup attempt fails.
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September 20-September 26
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Battle of the Menin Road Ridge (Intermediate phase of the Third Battle of Ypres).
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September 26-September 27
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Battle of Polygon Wood (Intermediate phase of the Battle of the Third Battle of Ypres).
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September 28–September 29
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Battle of Ramadi, Mesopotamia.
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October 4
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Battle of Broodseinde (part of the final phases of the Battle of the Third Battle of Ypres).
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October 9
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Battle of Poelcappelle (part of the final phases of the Battle of the Third Battle of Ypres).
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October 12
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First Battle of Passchendaele (part of the final phases of the Third Battle of Ypres).
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October 15–18
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Battle of Mahiwa.
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October 23
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Battle of Wadi Musa.
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October 23-November 10
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Battle of La Malmaison, delayed French attack on the Chemin des Dames.
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October 24–November 4
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Battle of Caporetto. The Austro-Hungarians and Germans break through the Italian lines. The Italian army is defeated and falls back on the Piave River.
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October 26-November 10
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Second Battle of Passchendaele (Closing phase of the Third Battle of Ypres).
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October 27
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Battle of Buqqar Ridge.
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October 30
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Italy: Vittorio Emanuele Orlando succeeds Paolo Boselli as Prime Minister.
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October 31–November 7
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Third Battle of Gaza. The British break through the Ottoman lines.
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October 31
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Battle of Beersheba (opening phase of the Third Battle of Gaza).
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November 1-November 6
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Battle of Tel el Khuweilfe.
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November 2
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Balfour Declaration: the British government supports plans for a Jewish "national home" in Palestine.
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November 5
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The Allies agree to establish a Supreme War Council at Versailles.
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November 7
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The October Revolution begins in Russia. The Bolsheviks seize power.
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Charge at Sheria.
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November 8
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Armando Diaz replaces Luigi Cadorna as Commander-in-Chief of the Italian Army.
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Charge at Huj.
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November 9–December 28
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First Battle of the Piave: the Austro-Hungarians and Germans try unsuccessfully to cross the river.
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November 10
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The Third Battle of Ypres (aka Battle of Passchendaele) ends in a stalemate.
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November 11-December 23
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First Battle of Monte Grappa, Austro-Hungarian offensive halted.
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November 13
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France: Paul Painlevé is replaced by Georges Clemenceau as Prime Minister.
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Battle of Mughar Ridge.
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November 14
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Battle of Ayun Kara.
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November 17
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Second Battle of Heligoland Bight, North Sea.
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November 17–December 30
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Battle of Jerusalem. The British enter the city (December 11).
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November 18-November 24
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Battle of Nebi Samwil, a phase of the Battle of Jerusalem.
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November 20–December 3
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First Battle of Cambrai. A British attack fails and the battle results in a stalemate.
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November 25
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Battle of Ngomano, the Germans invade Portuguese East Africa to gain supplies.
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December 1
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Battle of El Burj, a phase of the Battle of Jerusalem.
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December 7
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The United States declares war on Austria-Hungary.
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December 16
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Russia signs a preliminary armistice with Germany.
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December 20- December 21
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Battle of Jaffa, a phase of the Battle of Jerusalem.
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