Swiss 05/1940 MS406 and Me B109E3 being worked on

Wo would  say they fought alonside each other!?

No, during the war Switzerland was defending her airspace against all. Main fights occured in may 1940 when Germans violated deliberatly airspace, for escaping to french fighters, or for using an easy shortcut for their bombers targeting zones in the east of France. Later, dozens of american bombers landed or crashed on their way to and back from Germany. For example on September 4th 1944 2 Swiss Bf109e3 escorting to Dübendorf a B17 of 390BG 8AF were attacked by P51 of 503FS 339FG assuring bombers cover, one of the two Bf109 was downed, the second was damaged. Two Us pilots 2lt Ostrów, and 1st Lt Earl E.Erickson claimed this Victory.