The Germans used plenty of French tanks in Normandy.

I doubt it was a WW1 vintage tank though it may have been an FT-17 from a training unit as these would not show up on unit returns.

21st Panzer had large amounts of French kit, such as Somua and half-tracks. Not too mention their weird and wonderful SPG conversions. They also had Panzer IIIs and short barrelled MKIVs.

__________________
"The Americans will always do the right thing ... After they've exhausted all the alternatives."

Winston Churchill