That night, Bomber Command carried out Operation Hydra (1943), against facilities at Peenemünde on the night of 17–18 August 1943. The defences failed, and in the confusion around 100 night fighters were sent to Berlin, in the belief this was the target. Bomber Command sent out diversionary raids in the direction of the capital confusing matters further. Anti-aircraft defences mistook the large number of fighters for intruders and opened fire. 12 night fighters were lost—nine of them in action with British bombers and night fighter intruders.