ORP General Haller  ORP "General Haller" was a  originally built for the Imperial Russian Navy. She was later acquired by the Polish Navy and served until sunk during the Invasion of Poland on 6 September 1939. "General Haller" was built at Ab Crichton in Turku, Finland, for the Imperial Russian Navy. She was bought by the Polish Navy in 1921 and subsequently served as a school ship and minelayer. In Poland she was classified as "kanonierka" (gunboat). On 1 September 1939, under the command of Stanisław Mieszkowski, "General Haller" was patrolling the port of Gdynia, where she was damaged in air attacks. On 2 September, the gunboat was sent to the naval port at Hel. There she was turned into a floating battery, until on 3 September, after major bomb damage, all the guns were stripped and added to the defences on land. She was left floating until she was sunk on 6 September.