Follow the Bird!

Vallter: Blitzkrieg was an ideal battle tactic for WWII. But it was poor strategy. Because main forces proceeded further and guerillas felt themselves very well on the 'conquered' territory. This is a strategic failure.
But even considering my own grandfather have taken part in the Battle of Kursk, I can't tell, that tactic failed, if 4 defending (!!) soldiers died to kill one attacking German soldier. Just compare the casualties.