April 5 – May 5
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First Battle of Woevre.
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April 12–14
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Battle of Shaiba.
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April 19 – May 17
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The Ottomans besiege the Armenian city of Van.
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Details
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April 22 – May 25
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The Second Battle of Ypres, which ends in a stalemate. Germany first uses poison gas.
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Details
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April 22–23
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Battle of Gravenstafel, First stage of the Second Battle of Ypres.
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April 24 – May 5
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Battle of St Julien, part of the Second Battle of Ypres.
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April 24
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Start of the Armenian Genocide.
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Details
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April 25
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Allied forces land at Anzac Cove and Cape Helles in Gallipoli.
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Details
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London Pact between the Entente and Italy.
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Details
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April 28
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First Battle of Krithia. The Allied advance is repelled.
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Details
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