sentences:  The plane's bombs missed the U-boat and "U-515" failed to shoot down the aircraft.On 9 April "U-515" was attacked north of Madeira by the destroyers , , and .Flooding and loss of depth control forced the U-Boat to the surface, where she was sunk by rockets fired from Grumman Avenger and Grumman Wildcat aircraft and gunfire from the destroyers.