High Quality Content by WIKIPEDIA articles! HMS Calgarian was an armed merchant cruiser of the Royal Navy. She was sunk by the U-boat U-19 off Rathlin Island, Northern Ireland on 1 March 1918. The initial strike did not sink her and the crew managed to contain the damage. The U-boat torpedoed her again, despite the protection of other ships. She was hit by 4 torpedoes and quickly sank with the loss of two officers and 47 ratings.