Why Btonze Age?

[abaris]

The flags still work when everything goes to shit.  The Nazis tried to get too fancy, and paid for it.

Later on, for sure. But early on, radio communication along with refueling on the fly, gave them more than an edge. According to all military historians. French brass really wasn't on top of their game at the time. Apart from a select few like Gamelin and the obvious De Gaule, who wasn't but a colonel back then. But one of the first to notice the significance of independent tank units.