1917
| Dates | Events | |
|---|---|---|
| January 9 | Battle of Rafa. The British drive the Ottomans out of Sinai. | Details |
| January 16 | 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. | Details |
| February 1 | Germany resumes unrestricted submarine warfare. | Details |
| February 23 | Second Battle of Kut. The British recapture the city. | Details |
| February 23–April 5 | The Germans withdraw to the Hindenburg Line. | Details |
| March 1 | Arz von Straussenberg replaces Conrad von Hötzendorf as Austro-Hungarian Chief of Staff. | Details |
| March 8–March 11 | The British capture Baghdad. | Details |
| March 15 | Russia: Czar Nicholas II abdicates. A provisional government is appointed. | Details |
| March 26 | First Battle of Gaza. The British attempt to capture the city fails. | Details |
| April 6 | The United States of America declares war on Germany. | |
| April 9–April 12 | The Canadians obtain a significant victory in the Battle of Vimy Ridge. | Details |
| April 16–May 9 | The Second Battle of the Aisne (aka Nivelle Offensive) ends in disaster for both the French army and its commander Robert Nivelle. | Details |
| April 19 | Second Battle of Gaza. The Ottoman lines resist a British attack. | Details |
| April 29–May 20 | Series of mutinies in the French army. | Details |
| May 5–May 15 | Allied offensive on the Salonika Front. | |
| April 9–May 16 | Battle of Arras. The British attack a heavily fortified German line without obtaining any strategic breakthrough. | Details |
| May 12–June 6 | Tenth Battle of the Isonzo. | Details |
| May 15 | Philippe Pétain replaces Robert Nivelle as Commander-in-Chief of the French Army. | Details |
| May 23 | Battle of Mount Hermada in the Karst. | Details |
| June 7–June 8 | The British recapture Messines Ridge. | Details |
| June 10–June 29 | Battle of Mount Ortigara. | Details |
| June 12 | Greece: King Constantine I abdicates. | Details |
| June 25 | First American troops land in France. | Details |
| July 1–July 19 | The Kerensky Offensive fails. It is the last Russian initiative in the war. | Details |
| July 6 | Arab rebels led by Lawrence of Arabia seize the Jordanian port of Aqaba. | Details |
| July 20 | Corfu Declaration about the future Kingdom of Yugoslavia. | Details |
| July 31 | The Battle of Passchendaele (aka Third Battle of Ypres) begins. | Details |
| August 6–August 20 | Battle of Mărăşeşti. | Details |
| August 18–August 28 | Eleventh Battle of the Isonzo. | Details |
| September 8 | Russia: General Kornilov's coup attempt fails. | Details |
| September 27–September 28 | Battle of Ramadi, Mesopotamia. | Details |
| October 24–November 4 | 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. | Details |
| October 30 | Italy: Vittorio Emanuele Orlando succeeds Paolo Boselli as Prime Minister. | Details |
| October 31–November 7 | Third Battle of Gaza. The British break through the Ottoman lines. | Details |
| November 2 | Balfour Declaration: the British government supports plans for a Jewish "national home" in Palestine. | Details |
| November 5 | The Allies agree to establish a Supreme War Council at Versailles. | |
| November 7 | The October Revolution begins in Russia. The Bolsheviks seize power. | Details |
| November 8 | Armando Diaz replaces Luigi Cadorna as Commander-in-Chief of the Italian Army. | Details |
| November 9–December 28 | First Battle of the Piave: the Austro-Hungarians and Germans try unsuccessfully to cross the river. | Details |
| November 10 | The Battle of Passchendaele (aka Third Battle of Ypres) ends in a stalemate. | Details |
| November 13 | France: Paul Painlevé is replaced by Georges Clemenceau as Prime Minister. | Details |
| November 17 | Second Battle of Heligoland Bight, North Sea. | Details |
| November 20–December 3 | Battle of Cambrai. A British attack fails and the battle results in a stalemate. | Details |
| December 7 | The United States declares war on Austria-Hungary. | |
| December 8–December 26 | Battle of Jerusalem. The British enter the city (December 11). | Details |
| December 23 | Russia signs an armistice with Germany. |
Read more about this topic: Timeline Of World War I