The first use of the Panzerkampfwagen 35R 731(f) in combat was still during the summer campaign of 1940. Having quickly mastered their trophies, the Germans sent them into battle against their former masters.
However, there were very few cases like that. The slow and weakly armed Renault R 35 tanks could contribute little to the course of battle. These tanks can be distinguished by characteristic details that were not subsequently seen. In order to avoid being shot by their own comrades, the Germans painted large Balkenkreuze along the perimeter of the tank. The tanks were painted in gray (Schwarzgrau RAL 7021), but there are tanks in photographs that retained their French camouflage. The trophies captured in May-June of 1940 didn't see any significant conversions quite yet, all of that happened later.