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| 1915 January 24 |
| | | The German battle cruiser Blücher is sunk by the British off the Dogger Bank | |
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| 1915 January 30 |
| | | Two passenger liners are sunk by German U-boats | |
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| 1915 |
| | | February - British and French forces invade and capture the German colony of Cameroon | |
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| 1915 |
| | | Winston Churchill is a firm supporter of a new invention, the tank, encouraging its initial development while still at the Admiralty | |
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| 1915 March |
| | | A typhus epidemic sweeps through Serbia, severely weakening the nation's armed forces | |
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| 1915 March 18 |
| | | British and French battleships are sunk by mines in the Dardanelles, with the loss of 620 French sailors on one of them | |
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| 1915 March 21 |
| | | Two German Zeppelin airships bomb Paris, causing 23 deaths | |
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| 1915 April |
| | | In a secret pact, signed in London, Italy is promised territorial gains if she joins the Allied side | |
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| 1915 April 1 |
| | | The French aviator Roland Garros fires a machine gun through the propeller in his fighter plane, using metal plates to deflect any bullets that hit the propeller | |
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| 1915 April 22 |
| | | The Germans attempt an advance on the western front, launching the second battle of Ypres | |
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