roybatty & hillary,
i did a quick google search and couldn't find a creadible source for the cardboard tank view (i heard it on a germany history program a couple of years ago). imo it does make some sense since germany used many cardboard tanks in their maneuvers which could be eliminated by cavalry. the google search revealed however that the whole incident (with or without cardboard) seems to be more of a myth generated by the german propaganda in 1939 than anything else. apparently cavalry tried to attack german infantry and got surprised by german tanks.
regarding colaboration with the germans...this existed on all sides not just in france.
that they had nothing left to throw at the invading armies but their own bodies. Rather similar to the attacks the Poles made on Monte Cassino in which they used their own bodies to clutter the firing positions of the Germans barricaded within.
that does not sound very reasonable. unless you think you have a real chance of eliminating the enemy position or you are threatened by getting killed by your own troops (such as the soviets) if you don't storm the enemy position no normal person would sacrifice themselfs in such a way.