From my limited understanding the French hadn’t a clue as to proper use of armor at the outbreak of the war.
They sent their tanks into battle piecemeal instead of using them in tandem with infantry.
By their tactics they were doomed to fail.
In contrast General Patton had studied the writings of Rommel and Guderian and had a better understanding of the uses of armor with infantry in battle.
Patton said the problem with the Brits and French was they were always well prepared to fight the last war, not the new one.