Switzerland purchased 80 Bf-109s in 1938, they soldiered on to defend the Swiss neutrality throughout WW2 alongside the D-3801 which was, ironically, one of the main opponents of the 109 during the Battle of France (in its French version MS 406)!

Armament of the Bf 109E consisted of two wing cannon and two light machine guns on top of the nose. A nose cannon firing through the hollow propeller shaft was rarely fitted in practice.