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HMS H4 was a British H-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on 11 January 1915 and was commissioned on 5 June 1915. After her commissioning, HMS H4 and sister ships H1, H2 and H3 crossed the Atlantic from St. John's, Newfoundland to Gibraltar being escorted by the armed merchant cruiser HMS Calgarian. H4 sank the U-boat UB-52 in the Adriatic Sea on 23 May 1918. She was sold on 30 November 1921 in Malta.
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