In April 1944, 12 further G-6s were acquired in exchange for the destruction of a highly secret Messerschmitt Bf 110G night fighter which made an emergency landing in Switzerland.
On 1 June, the Flugwaffe dispatched 12 Bf 109 E-1s to engage 36 unescorted German Heinkel He 111s of Kampfgeschwader 53 that were crossing Swiss airspace to attack the Lyon - Marseilles railway system.