Friedrichshafen lies in the
Bodenseekreis district on
Lake Constance in the extreme south of Germany, and at the time it was at the edge of the German
nightfighter defences. Targets included the
Dornier Flugzeugwerke aircraft works at Manzell, the
Maybach tank engine factory, the
Luftschiffbau Zeppelin aircraft works and its
Oberraderach test facility near Raderach, and the
Zahnradfabrik Friedrichshafen (literally "gearwheel factory Friedrichshafen") tank gearbox factory. In February 1944 an underground factory at
Immenstaad near Friedrichshafen was suspected to be a synthetic oil and/or liquid oxygen plant. KZ Nebenlager Raderach and the
Aufkirch subcamp of
Dachau concentration camp was used for constructing an underground facility for armament manufacturing (code name "Magnesit") safe from Allied air raids. A second facility (codenamed "
Richard I") was established under
Radobýl mountain in
Central Bohemia. ==Attacks==