Answer:
Speed
Explanation:
The German way of winning in the early stages of the war relied on a tactic known as "Blitzkreig" Or "Lightning war" What they would do is tanks would charge across enemy lines. Troops would encircle the enemy forces and the supply lines would be in the back making sure a steady stream of supplies would reach the front line. So if your asking how they were effective in moving through enemy lines their you are.
