On 25 April 1915 during the landing at V Beach, Cape Helles, Gallipoli, Turkey, Midshipman Malleson and three others (William Charles Williams, George Leslie Drewry, George McKenzie Samson) of HMS River Clyde assisted the commander (Edward Unwin) of the ship at the work of securing the lighters under very heavy rifle and Maxim fire.
There are two memorials to him in Chepstow - a painting by Charles Dixon of the events in the Dardanelles, hanging in St Mary's Church; and a naval gun from the German submarine SM UB-91 presented by King George V, which stands in the town's main square beside the war memorial.
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