Motherland,
Even just refering to WWII the French were not cowards. In the three week Battle of France nearly 100,000 Frenchmen died defending her, and they did not die shot in the back. Not a single French unit in WWII broke and ran. A nation's army does not incur those kinds of losses by not fighting.
The French were undone by outdated tactics and a completely fubared political situation in their government. The French themselve fought with valor against a foe that was far better organized and against tactics designed to overcome the outdated tactics the French were saddled with.
Contrary to what certain people in the US want you to think, the French did not surrender enmasse at the first sight of German soldiers.
To understand the French mindset going into WWII you'd have to understand the French experience in WWI. The utter horror that happened on French soil and the staggering losses inflicted on the French people in that war. To come out the winners in what had to be one of the most pyhric victories of all time and to be resloved never to suffer it again....and then it starts again...