The Gloucester Castle was a steam ship requisitioned by the British for use as a hospital ship during the First World War, operating in the Mediterranean between Lemnos and Malta and taking the wounded back across the English Channel from the Western Front. On one such voyage from Le Havre to Southampton on 31st March 1917 when carrying 399 patients including 300 cot cases, she was torpedoed by German U-boat U-32 off the Isle of Wight. All the patients were evacuated by the attendant destroyers and other transports, but three unfortunately died during the transfer. Although badly damaged she was eventually towed into port.