December 1917
| Date | Events |
|---|---|
| The second French offensive at Verdun continues until 15 December, having begun on 20 August | |
| The Twelfth Battle of the Isonzo also continues, ends 26 December | |
| 1 | Last German forces driven out of German East Africa into Portuguese territory |
| 2 | Hostilities between Russian and German forces cease |
| 3 | First session of peace delegates from Russia and Central Powers takes place at Brest-Litovsk |
| 3 | Allied conference in Paris resolves to establish an Allied Maritime Transport Council, principally to co-ordinate shipping |
| 6 | Finland declares independence |
| 6 | Hostilities between Rumania and German forces cease |
| 6 | Brest-Litovsk meeting suspended after truce arranged; truce begins next day |
| 6 | United States Battleship Division joins British Grand Fleet at Scapa Flow |
| 7 | United Stares declares war on Austria-Hungary |
| 7 | Ecuador severs diplomatic relations with Germany |
| 9 | Jerusalem falls to British forces in Palestine |
| 9 | In Italian naval raid on Trieste harbour, the Austrian battlehsip "Wien" is sunk |
| 9 | Rumanians agree armistice with Central Powers: the Truce of Focsani; hostilities cease next day |
| 10 | Panama declares war on Austria-Hungary |
| 10 | Cardosa de Paes succeeds A. A. da Costa as Portuguese premire |
| 11 | Russian constituent assembly meets in Petrograd: it is broken up by Bolshevik forces two days later |
| 11 | General Sir Edmund Allenby makes formal entry to Jerusalem |
| 11 | Machado Guimaraes is deposted as President of Portugal |
| 12 | German submarine shells Madeira |
| 12 | HMS "Partridge" sunk in North Sea during German destroyer raid on a convoy |
| 13 | Brest-Litovsk talks resume |
| 14 | French recall General Sarrail from Salonika command; he is replaced by Guillaumat on 22 December |
| 15 | Armistice signed between Russia and Central Powers: begins noon 14 December and lasts until 14 January 1918 |
| 16 | Cuba declares war on Austria-Hungary |
| 17 | British government gives written assurance of independence of Arab people to King of the Hejaz |
| 21 | Battle of Jaffa begins in Palestine, ends next day |
| 22 | Peace negotiations commence at Brest-Litovsk. Russians and Germans also agree secret deal concerning Poland |
| 22 | Lieut-General Sir R C maxwell resigns at Quartermaster-General of the BEF; replaced by Lt-Gen Sir T E Clarke |
| 23 | Independent republic of Moldavia proclaimed at Kishinev |
| 26 | British defence of Jerusalem begins as Turks counter attack; ends on 30 December |
| 26 | Admiral Sir John Jellicoe resigns as First Sea Lord; is replaced next day by Admiral Sir Rosslyn Wemyss |
| 28 | da Silva Paes is appointed Acting President of Portugal |