Built by Paul Rodgers and Company in 1892 for Lord Penrhyn, the Mary B. Mitchell was initially intended as a private yacht but was converted shortly after for use as a cargo-carrying coaster. In 1916 she was spotted lying in Falmouth by the British Admiralty, requisitioned and fitted out as Q-ship No. Q9. Ostensibly in shabby condition, displaying rust streaked plating and grimy sails her appearance was deliberately deceptive. False bulwarks concealed 5 guns and her naval crew disguised themselves in civilian clothing. On December 2nd 1916 she encountered gunfire from a U-boat in the Western Approaches. The schooner surprised her enemies as the false bulwarks fell away and the crew retaliated, sinking the submarine. She also survived a torpedo the same year that passed within yards of her hull. Surviving the War, she was eventually wrecked in 1944 in the Solway Firth.