Asymptote
Banned Idiot
How would zombies overwhelm a tank division!?!?!?! Tanks would just run them over....
You do realize, while a tank is enormously heavy and cannot be push over by a single man.. how about 7 million zombies?? The tank might be able to run over a few hundreds or maybe thousands of zombies, but then as the ground gets greasy with all the bloody entrails, the tank will get bog down and eventually get topple over by the zombie hordes.