 Six Allied aircraft were shot down by Swiss Air Force fighters and four by anti-aircraft cannons, killing 36 Allied airmen.The first Allied aircraft to be shot down over were two British bombers flying low over Swiss territory on the night of 12–13 July 1943, which were shot down by Swiss anti-aircraft fire over Valais.The first American bomber shot down over Switzerland was downed near Bad Ragaz on 1 October 1943, and only three of its crew survived.