German submarine U - 1163 German submarine " U - 1163 " was a Type VIIC / 41 U - boat of the German " Kriegsmarine " during World War II . She was ordered on 14 October 1941 , and was laid down on 5 December 1942 at Danziger Werft AG , Danzig , as ' werk 135 ' . She was launched on 12 June 1943 and commissioned under the command of " Oberleutnant " Ernst - Ludwig Balduhn on 6 October of that year . Service record . " U - 1163 " did not have a very prosperous career . While she was commissioned on 6 October 1943 , it was not until 3 December 1944 that she sank her first ( and only ) enemy vessel . Despite her lack of ships sunk , " U - 1163 " was one of only a handful of German U - boats in World War II to help shoot down a De Havilland Mosquito on 2 August 1944 . " U - 1163 " spent her first eight months in the Kriegsmarine undergoing training operations with the German 8th Submarine Flotilla ( " 8th U - boat Flotilla " ) . At the end of her training , she was formally assigned to the " 11th U - boat Flotilla " stationed in Norway . She began her first patrol on 13 July 1944 , almost a full three years after she was ordered . First patrol . Following training exercises with the " 8th U - boat Flotilla " and a journey from Kiel to Flekkefjord Norway , " U - 1163 " began her first official war patrol with the " 11 . Unterseebootsflottille " on 13 July 1944 . After only seven days at sea however , " U - 1163 " returned to Norway in the coastal town of Arnöy on 19 July . Second patrol . After her first patrol , " U - 1163 " spent the next three months traveling up the coast of Norway . On 2 August , " U - 1163 " and an accompanying U - boat , were traveling on the surface from Stavanger to Kristiansand and had the protection of surface escorts as well . Yet despite all of the measures , two de Havilland Mosquito s ( E / 333 and S / 333 ) attacked the two U - boats . S / 333 was shot down by anti - aircraft fire during the attack and the two U - boats were undamaged . < ref name = Uboat . net / air > < / ref > On 15 October 1944 , " U - 1163 " began her second war patrol after leaving Bogenbucht . For 17 days , " U - 1163 " roamed the Arctic Ocean in search of any Allied convoys heading to the Soviet Union . On 31 October , after not a single engagement with any enemy vessels , " U - 1163 " entered Hammerfest , Norway . Third patrol . " U - 1163 " < nowiki > ' s < / nowiki > third patrol began on 25 November 1944 after she left the port city of Kilbotn . For 22 days , she traveled through the Arctic Ocean in search of any Allied vessels heading to or from the Soviet Union . On 3 December 1944 , " U - 1163 " claimed the only enemy vessel in her career . The " Revoljucija " , a Soviet 433 - ton cargo steam ship , had been separated from her convoy after developing engine trouble , and was stopped , protected by a single minesweeper . The U - 1163 hit the " Revoljucija " with a single torpedo , sinking her along with her 23 crew . Thirteen days later , on 16 December , " U - 1163 " returned to Bogenbucht . Fourth patrol . The last patrol that " U - 1163 " took part in began on 15 April 1945 . She left Kristiansand that day and traveled to the north coast of Ireland . After 25 days at sea , returned to Marviken , Norway where she was handed over to the Allies following the surrender of all German forces a few days before .