ss "calgarian" was an armed merchant cruiser of the royal navy. she was sunk by the u-boat 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.