Probably june 1940.
French soldiers of the 215th infantry regiment making fun of Mussolini and Hitler...

Nice imitation...

In 1937 the French began to design a new model of B1 tank to improve it: the B1 Ter. The armor was even thicker, got a new shape for better deflection and covered the tracks, and a crew member was added to operate the 75mm canon to allow the pilot to concentrate on driving. 
Unfortunately only 3 of them were produced before the end of the campaign.

B1 Ter

The tank destroyer Laffly was designed in the hurry of may 1940. Only 70 were produced in may and june, armed with a 47mm gun. It was quite effective but came too late.