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| 1915 September 25 |
| | | The British use chlorine gas for the first time in an attack on Loos, but in places it is blown back over the British lines when the wind changes | |
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| 1915 November 22 |
| | | A British and Indian force is defeated by the Turks at Ctesiphon, on the bank of the Tigris | |
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| 1916 February 21 |
| | | A German thrust against the French begins the year-long battle of Verdun | |
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| 1916 May 31 |
| | | The German and British fleets clash off Jutland, in a hard-fought but inconclusive encounter | |
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| 1916 June 24 |
| | | An Allied advance in the valley of the Somme launches a four-month battle with very heavy casualties | |
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| 1917 April 12 |
| | | Canadian troops take Vimy Ridge, subsequently the site of Canada's most important war memorial | |
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| 1917 July 6 |
| | | T.E. Lawrence and an Arab force surprise the Turkish garrison at Aqaba and win an overwhelming victory | |
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| 1917 July 31 |
| | | Haig sends British troops over the top in the third battle of Ypres | |
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| 1917 |
| | | Ocxtober 24 - a victory at Caporetto enables the Austrian army to penetrate far into northeast Italy | |
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| 1917 November 6 |
| | | British and Canadian infantry, slithering through a morass of mud, capture the village of Passchendaele | |
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