 During the time ON 207 was in "Siegfried"s patrol area, none of its boats were able to launch an attack, and none of ON 207s ships were harmed by enemy action.While this action was taking place, "Siegfried"s refuelling group was also under attack, from two USN Hunter-killer groups centred on the escort carriers and .On the night of 25/26 October they attacked the U-tanker , though she escaped with no damage; on 28 October they attacked two U-boats, , which was destroyed, and which was damaged and forced to return to base.