第一次世界大戰大事年表
1917年

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| Dates | Theater/Front/Campaign | Events |
| --- | --- | --- |
| January 3–4 | African | Battle of Behobeho. |
| January 9 | Middle Eastern | Battle of Rafa. The British drive the Ottomans out of Sinai. (Details) |
| January 11 – March 13 | Western | British raid the Ancre. (Details) |
| January 16 | Politics | The German Foreign Secretary Arthur Zimmermann sends a telegram to his ambassador in Mexico, instructing him to propose an alliance against the United States to the Mexican government. (Details) |
| February 1 | Naval | Germany resumes unrestricted submarine warfare. (Details) |
| February 3 | Naval | SS Housatonic an American steamer carrying wheat from Galveston, Texas to England is sunk by a U-boat. |
| February 13 | Politics | Mata Hari is arrested in Paris on charges of spying for the Germans. |
| February 23 | Middle Eastern | Second Battle of Kut. The British recapture the city. (Details) |
| February 23 – April 5 | Western | The Germans withdraw to the Hindenburg Line. |
| March 1 | Politics | Arz von Straussenberg replaces Conrad von Hötzendorf as Austro-Hungarian Chief of Staff. (Details) |
| March 3 | African | The French relieve Agadez. |
| March 8–11 | Middle Eastern | The British capture Baghdad. (Details) |
| March 8 | Politics | The celebrations of the International Women's Day in Petrograd spawn severe protests that will evolve into the February Revolution. |
| March 12 | Politics | Russian troops refuse to fire on demonstrators after 50 are killed in Petrograd's Znamenskaya Square the day before. Numerous attacks against prisons, courts, police stations and Okhrana offices. Provisional Committee of the Duma formed. Petrograd Soviet formed. |
| March 13 | African | Battle of Nambanje. |
| March 13 – April 23 | Middle Eastern | Samarra offensive, British capture much of Mesopotamia. |
| March 14 | Politics | China severs relations with Germany. |
| March 15 | Politics | Nicholas II abdicates. A provisional government is formed. |
| March 16 | Politics | Lenin arrives in Petrograd from his exile in Switzerland and publishes his April Thesis. |
| March 17 | Politics | Aristide Briand resigns as Prime Minister of France; he is replaced by Alexandre Ribot. |
| March 26 | Middle Eastern | First Battle of Gaza. The British attempt to capture the city fails. (Details) |
| April–October | Middle Eastern | Stalemate in Southern Palestine. |
| April 2–3 | Western | Australians attack Noreuil. (Details.) |
| April 6 | Politics | The United States declares war on Germany. (Details) |
| April 7 | Politics | Cuba declares war on Germany. |
| April 7 | Politics | Panama declares war on Germany. |
| April 7 | Asian and Pacific | Scuttling of SMS Cormoran in Guam, the only hostile action between American and German forces in the Pacific. |
| April 9 – May 17 | Western | Second Battle of Arras. The British attack a heavily fortified German line without obtaining any strategic breakthrough. (Details) |
| April 9–12 | Western | The Canadians obtain a significant victory in the Battle of Vimy Ridge, part of the first phase of the Second Battle of Arras. (Details) |
| April 9–14 | Western | First Battle of the Scarpe, part of the first phase of the Second Battle of Arras. (Details) |
| April 10–11 | Western | First Battle of Bullecourt, part of the first phase of the Second Battle of Arras. (Details) |
| April 11 | Politics | Brazil severs relations with Germany. |
| April 13 | Politics | Bolivia severs relations with Germany. |
| April 15 | Western | Battle of Lagnicourt, part of the Second phase of the Second Battle of Arras. (Details) |
| April 16 – May 9 | Western | The Second Battle of the Aisne (also known as Nivelle Offensive) ends in disaster for both the French army and its commander Robert Nivelle. (Details) |
| April 17–20 | Western | Battle of the Hills (also known as Third battle of Champagne), a diversion to the Second Battle of the Aisne. |
| April 19 | Middle Eastern | Second Battle of Gaza. The Ottoman lines resist a British attack. (Details) |
| April 22 – May 8 | Balkan | Second Battle of Doiran. (Details) |
| April 23 | Politics | The Ottoman Empire severs relations with the United States. |
| April 23–24 | Western | Second Battle of Scarpe, part of the second phase of the Second Battle of Arras. (Details) |
| April 28–29 | Western | Battle of Arleux, part of the Second phase of the Second Battle of Arras. (Details) |
| April 29 – May 20 | Western | Series of mutinies in the French army. (Details) |
| May 3–4 | Western | Third battle of the Scarpe, part of the second phase of the Second Battle of Arras. (Details) |
| May 3–4 | Politics | Mass demonstrations in Petrograd and Moscow to protest Pavel Milyukov's note affirming Russia's commitment to the Entente war effort. (Details) |
| May 3–17 | Western | Second Battle of Bullecourt, part of the second phase of the Second Battle of Arras. (Details) |
| May 5 | Politics | Australian Prime Minister Billy Hughes wins an enlarged majority in federal elections with the pro-conscription Nationalist Party. (Details) |
| May 5–15 | Balkan | Allied Spring offensive on the Salonika Front. |
| May 5–9 | Balkan | Second Battle of the Cerna Bend, a phase of the Allied Spring Offensive. (Details) |
| May 12 – June 6 | Italian | Tenth Battle of the Isonzo. (Details) |
| May 15 | Western | Philippe Pétain replaces Robert Nivelle as Commander-in-Chief of the French Army. (Details) |
| May 23 | Italian | Battle of Mount Hermada in the Karst. |
| May 23 | Politics | Salonika Trial ends: Dragutin Dimitrijevic, chief conspirator of the Sarajevo Assassination, is sentenced to death by Serbia on trumped up charges, as part of negotiations for a peace treaty with Austria-Hungary. |
| June–October | Western | Operation Hush, Abortive British plan to capture coast of Belgium. |
| June 7–14 | Western | Second Battle of Messines, the British blow 19 deep mines and recapture Messines Ridge. (Details) |
| June 10–29 | Italian | Battle of Mount Ortigara. (Details) |
| June 12 | Politics | Constantine I of Greece abdicates. |
| June 13 | Air | First successful heavy bomber raid on London done by the Gotha G.IV. |
| June 25 | Western | First American troops land in France. (Details) |
| June 27 | Western | Batterie Pommern aka. 'Lange Max', world's largest gun fires for the first time from Koekelare to Dunkirk (±50 km). |
| June 30 | Politics | Greece declares war on the Central powers. (Details) |
| July 1–2 | Eastern | Battle of Zborov, a phase of the Kerensky Offensive. (Details) |
| July 1–12 | Politics | Brief monarchist coup and restoration in China, allegedly promoted by Germany to distance China from the Entente. (Details) |
| July 1–19 | Eastern | The Kerensky Offensive fails. It is the last Russian initiative in the war. (Details) |
| July 6 | Middle Eastern | Arab rebels led by Lawrence of Arabia seize the Jordanian port of Aqaba. (Details) |
| July 11 | Western | The Open Letter to Albert I is published by Flemish Movement sympathisers within the Belgian Army on the Yser Front, complaining about official discrimination against Dutch language (Details) |
| July 16–17 | Politics | Petrograd July Days. |
| July 19 | Politics | The Reichstag passes a Peace Resolution. |
| July 20 | Politics | Corfu Declaration about the future Kingdom of Yugoslavia. (Details) |
| July 21 | Politics | Alexander Kerensky replaces Georgy Lvov as Minister-President of the Russian Provisional Government. |
| July 22 | Politics | Siam declares war on Germany and Austria-Hungary. |
| July 22 – August 1 | Balkan | Battle of Mărăști |
| July 29 | African | Battle of Kiawe Bridge. |
| July 31 | Western | The Third Battle of Ypres (also known as Battle of Passchendaele) begins. (Details) |
| July 31 – August 2 | Western | Battle of Pilckem Ridge (Opening phase of the Third Battle of Ypres). |
| August 2 | Asian and Pacific | The German raider SMS Seeadler is wrecked at Mopelia in French Polynesia. |
| August 2–10 | African | Battle of Rumbo. |
| August 4 | Politics | Liberia declares war on Germany. |
| August 6–20 | Balkan | Battle of Mărăşeşti. (Details) |
| August 8–22 | Balkan | Third Battle of Oituz. |
| August 14 | Politics | China declares war on Germany and Austria-Hungary. |
| August 15–25 | Western | Battle of Hill 70 (Continuation of British operations near Lens). |
| August 16–18 | Western | Second Battle of Langemarck (Initial phase of the Third Battle of Ypres). (Details) |
| August 17 | Asian and Pacific | China terminates the German and Austro-Hungarian concessions in Tianjin and occupies them. |
| August 18–28 | Italian | Eleventh Battle of the Isonzo. (Details) |
| August 20–26 | Western | Second Offensive Battle of Verdun. |
| September – October | Eastern | Operation Albion. German capture of Oesel, Dago and Moon Islands. |
| September 1–3 | Eastern | Battle of Jugla. |
| September 5 | Asian and Pacific | The SMS Seeadler's crew sail to Fiji in a lifeboat and capture the French schooner Lutece, allowing their escape. They rename it Fortuna. |
| September 5–12 | Politics | The Third Zimmerwald Conference of the anti-war socialist Zimmerwald Movement, is held in Stockholm. (Details) |
| September 8–12 | Politics | Russia: General Kornilov's coup attempt fails. (Details) |
| September 12 | Politics | Alexandre Ribot resigns as Prime Minister of France; he is replaced by Paul Painlevé. |
| September 14 | Politics | Russia declared a republic. |
| September 20–26 | Western | Battle of the Menin Road Ridge (Second phase of the Third Battle of Ypres). |
| September 21 | Politics | Costa Rica severs relations with Germany. |
| September 26–27 | Western | Battle of Polygon Wood (Second phase of the Third Battle of Ypres). |
| September 28–29 | Middle Eastern | Battle of Ramadi, Mesopotamia. (Details) |
| October 4 | Western | Battle of Broodseinde (Second phase of the Third Battle of Ypres). |
| October 5 | Asian and Pacific | The Fortuna wrecks at Easter Island and its crew is interned by the Chileans. |
| October 6 | Politics | Peru severs relations with Germany. |
| October 7 | Politics | Uruguay severs relations with Germany. |
| October 9 | Western | Battle of Poelcappelle (Last phase of the Third Battle of Ypres). |
| October 12 | Western | First Battle of Passchendaele (Last phase of the Third Battle of Ypres). |
| October 15 | Politics | Mata Hari executed. |
| October 15–18 | African | Battle of Mahiwa. |
| October 23 | Middle Eastern | Battle of Wadi Musa. |
| October 23 – November 10 | Western | Battle of La Malmaison, much-postponed French attack on the Chemin des Dames. (Details) |
| October 24 – November 4 | Italian | 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 26 | Politics | Brazil declares war on Germany. |
| October 26 – November 10 | Western | Second Battle of Passchendaele (Last phase of the Third Battle of Ypres). |
| October 27 | Middle Eastern | Battle of Buqqar Ridge. |
| October 30 | Politics | Italy: Vittorio Emanuele Orlando succeeds Paolo Boselli as Prime Minister. (Details) |
| October 31 – November 7 | Middle Eastern | Third Battle of Gaza. The British break through the Ottoman lines. (Details) |
| October 31 | Middle Eastern | Battle of Beersheba (opening phase of the Third Battle of Gaza). (Details) |
| November 1–6 | Middle Eastern | Battle of Tel el Khuweilfe. |
| November 2 | Politics | Balfour Declaration: the British government supports plans for a Jewish "national home" in Palestine. (Details) |
| November 5 | Politics | The Allies agree to establish a Supreme War Council at Versailles. |
| November 7 | Politics | October Revolution: Kerensky flees Petrograd just before the Petrograd Soviet seizes the Winter Palace. |
| November 7 | Middle Eastern | Charge at Sheria. |
| November 8 | Italian | Armando Diaz replaces Luigi Cadorna as Commander-in-Chief of the Italian Army. (Details) |
| November 8 | Middle Eastern | Charge at Huj. |
| November 9 – December 28 | Italian | First Battle of the Piave: the Austro-Hungarians and Germans try unsuccessfully to cross the river. (Details) |
| November 10 | Western | The Third Battle of Ypres (also known as Battle of Passchendaele) ends. (Details) |
| November 11 – December 23 | Italian | First Battle of Monte Grappa, Austro-Hungarian offensive halted. |
| November 13 | Politics | France: Paul Painlevé is replaced by Georges Clemenceau as Prime Minister. (Details) |
| November 13 | Middle Eastern | Battle of Mughar Ridge. |
| November 14 | Middle Eastern | Battle of Ayun Kara. |
| November 17 | Naval | Second Battle of Heligoland Bight, North Sea. (Details) |
| November 17 – December 30 | Middle Eastern | Battle of Jerusalem. The British enter the city (December 11). (Details) |
| November 18–24 | Middle Eastern | Battle of Nebi Samwil, a phase of the Battle of Jerusalem. |
| November 19 | Italian | Battle of Caporetto ends. Central Powers take a quarter of a million prisoners. (Details) |
| November 20 – December 3 | Western | First Battle of Cambrai. A British attack and the biggest German attack against the British since 1915 succeed and the battle is a stalemate. (Details) |
| November 25 | African | Battle of Ngomano, the Germans invade Portuguese East Africa to gain supplies. |
| December 1 | Middle Eastern | Battle of El Burj, a phase of the Battle of Jerusalem. |
| December 6 | Naval | Halifax Explosion: An accidental collision between the Norwegian supply ship SS Imo and the French cargo ship SS Mont-Blanc, laden with high explosives for the Western Front, leaves 2,000 dead and 9,000 injured in Richmond, Nova Scotia. It is the largest man-made explosion before the invention of atomic weapons. |
| December 6 | Politics | Finland declares independence from Russia. |
| December 7 | Politics | The United States declares war on Austria-Hungary. |
| December 8 | Politics | Ecuador severs relations with Germany. |
| December 9 | Politics | Romania signs an armistice with the Central Powers. |
| December 10 | Politics | Panama declares war on Austria-Hungary. |
| December 11 | Middle Eastern | General Allenby leads British and Indian troops into Jerusalem, ending 400 years of Ottoman rule. |
| December 15 | Politics | Armistice between Russia and the Central Powers, to take effect on December 17. |
| December 16 | Politics | Armistice of Erzincan between the Ottomans and the Russian Special Transcaucasian Committee. |
| December 17 | Politics | Canadian Prime Minister Robert Borden wins an enlarged majority in federal elections with the pro-conscription Unionist Party. (Details) |
| December 20–21 | Middle Eastern | Battle of Jaffa, a phase of the Battle of Jerusalem. (Details) |