There are several incidents, when U-Boats repelled attacks by aircraft(s), one famous would be the "Fight back" of U-758 on June 8.1943. This boat was attacked by eight Avengers of the USS Bogue and downed two of em, while returning home without severe damage. U-763 downed two Liberators on Feb. 4th and a Halifax on the next day. U-648 downed a Whitley on May 17th, a Sunderland on Nov. 20 and a Liberator on Nov. 21 1943. These are just some examples of a successful fight against aircraft, considering that they even downed a Mustang (U-155), Beaufighters and so on, how did these subs manage to down an aircraft or several, while others (the major part) failed. At least 220 subs were lost to aircraft attacks, had those mentioned just luck? How skilled were the Flak Gunners of the U-boatforce (?their trainig program?) and how useful was the AA-Armament, for example were there any apparatus to balance the swell http://uboat.net/history/aircraft_losses.htm U-758 Regards, Che.