The Germans agree an armistice with Bolshevik Russia.
British Empire forces are victorious over the Ottomans at the Battle of Jaffa in Palestine.
After initial success, the British attack on German positions at Cambrai results in stalemate.
British Empire forces launch a successful offensive against the Ottomans in Palestine, culminating in General Edmund Allenby’s entry into the city of Jerusalem.
The Second Battle of Heligoland Bight, a naval engagement between Britain and Germany in the North Sea, ends in stalemate.
British Empire troops are victorious over the Ottomans at the Battle of Mughar Ridge in Palestine.
The Third Battle of Ypres (also known as Passchendaele) ends in stalemate.
The Austro-Hungarians and Germans fail to force a river crossing during the First Battle of the Piave against the Italians.
General Armando Diaz replaces General Luigi Cadorna as Commander-in-Chief of the Italian Army.
The Bolsheviks seize power in Russia during the October Revolution.
The Allies agree to establish a Supreme War Council at Versailles.
Georges Clemenceau replaces Paul Painlevé as French Prime Minister.
The Allies break through the Ottoman lines at the Third Battle of Gaza in Palestine.
British and Australian troops enjoy further success over the Ottomans at the Battle of Beersheba in Palestine.
Vittorio Emanuele Orlando succeeds Paolo Boselli as Italian Prime Minister.
British and Australian troops are victorious over the Ottomans at the Battle of El Buggar Ridge in Palestine.
Part of the Third Battle of Ypres: The Second Battle of Passchendaele, the final phase of the Ypres operations, ends in deadlock.
The Austro-Hungarians and Germans defeat the Italians at the Battle of Caporetto (also known as the Twelfth Battle of the Isonzo).
A French success at the Battle of Malmaison captures much of the strategically important Chemin des Dames ridge.
The Germans secure victory over British forces at the Battle of Mahiwa in German East Africa (now Tanzania).
Part of the Third Battle of Ypres: A British Empire and French attack at the First Battle of Passchendaele ends in a German defensive success.
Part of the Third Battle of Ypres: British, French and Australian assaults are repulsed by the Germans during the Battle of Poelcappelle.
Part of the Third Battle of Ypres: British, Australian and New Zealand forces enjoy success at the Battle of Broodseinde.
British-Indian troops are victorious at the Battle of Ramadi in Mesopotamia (now Iraq).
Part of the Third Battle of Ypres: British and Australian troops secure limited gains during the Battle of Polygon Wood.
Part of the Third Battle of Ypres: British forces enjoy success at the Battle of the Menin Road Ridge.
The Germans use mustard gas against British troops for the first time during the Third Battle of Ypres.
Part of the Third Battle of Ypres: The British and French are repulsed during the Battle of Langemarck.
The Battle of Hill 70 near Lens sees limited Canadian success against the Germans.
Petty Officer Walter Yeo, badly burned during the Battle of Jutland (1916) on HMS ‘Warspite’, becomes the first person to undergo advanced plastic surgery when he is treated by Sir Harold Gillies.
Part of the Third Battle of Ypres: A British attack is repulsed during the Battle of Pilckem Ridge.
Allied forces launch an offensive in Belgium, but in appalling weather conditions the Third Battle of Ypres (also known as Passchendaele) soon becomes an attritional slogging match.
The Tank Corps is formed to co-ordinate the growing use of tanks in the British Army.
King George V changes the Royal Family’s name from Saxe-Coburg-Gotha to the less German-sounding Windsor.
Arab rebels led by Colonel TE Lawrence (also known as Lawrence of Arabia) seize the Ottoman port of Aqaba.
The last Russian attack of the war, the Kerensky Offensive, is defeated by the Central Powers.
The Queen’s Hospital in Sidcup, Kent is opened to specialise in the treatment of soldiers’ facial injuries.
US Army doctor, Captain Oswald Robertson, sets up the first blood bank on the Western Front.
British, Australian, Canadian and New Zealand forces capture the Messines Ridge from the Germans.
General Philippe Pétain replaces General Robert Nivelle as Commander-in-Chief of the French Army.
The Royal Navy introduces the convoy system to protect shipping from German U-Boats.
Part of the Battle of Arras: British attacks on German positions are repulsed at the Third Battle of the Scarpe.
Part of the Battle of Arras: A British and Australian assault is repelled during the Second Battle of Bullecourt.
A series of mutinies weakens the French Army. From this point onwards the British Empire takes on a greater role in the fighting.
Part of the Battle of Arras: The British and Canadians secure limited gains during the Battle of Arleux.
Part of the Battle of Arras: British and Newfoundland troops launch an unsuccessful attack in the Second Battle of the Scarpe.
The Second Battle of Doiran on the Salonika front ends in a Bulgarian victory over the Allies.
The Ottomans resist another British attack at the Second Battle of Gaza in Palestine.
The Second Battle of the Aisne (or the Nivelle Offensive) ends in disaster for the French Army and its commander General Robert Nivelle.
Part of the Battle of Arras: The Germans mount a counter-offensive against Australian forces at the Battle of Lagnicourt.
Part of the Battle of Arras: A British and Australian attack is beaten off by the Germans at the First Battle of Bullecourt.
Part of the Battle of Arras: The Canadians obtain a significant victory over the Germans in the Battle of Vimy Ridge. This engagement sees the first successful use by British Empire forces of flash-spotting and sound-ranging techniques to detect and suppress enemy batteries.
Part of the Battle of Arras: Despite heavy casualties at the hands of the Germans, British forces secure limited gains.
The Arras offensive sees British, Australian, Canadian, Newfoundland and New Zealand troops attack heavily fortified German lines without obtaining any strategic breakthrough.
The first detachment of the Women’s Army Auxiliary Corps (WAAC) arrives on the Western Front, under the command of Assistant Controller Helen Gwynne Vaughan.
British and Australian troops are defeated by the Ottomans at the First Battle of Gaza in Palestine.
The Russian Tsar Nicholas II abdicates. A provisional government is appointed.
The British mount a successful offensive against the Ottomans at Samarrah in Mesopotamia (now Iraq).
British-Indian forces capture Baghdad in Mesopotamia (now Iraq).
General Arz von Straussenberg replaces General Conrad von Hötzendorf as Austro-Hungarian Chief of Staff.
German forces on the Western Front withdraw to strongly defended positions along the Hindenburg Line.
British-Indian forces recapture the city of Kut in Mesopotamia (now Iraq) from the Ottomans.
The British enjoy success against the Ottomans at the Battle of Nahr-al-Kalek in Mesopotamia (now Iraq).
The British drive the Ottomans out of Sinai following the Battle of Rafa.
Fighting takes place between the Italians and Austro-Hungarians along the Isonzo (now the Soča) valley. A total of 12 battles are fought in this location, wearing down the armies of both nations over the following two years.