Question

What was the key German weapon in the battle of the Atlantic

Answer 1

The German's key weapon was submarines.

Answer 2

The U-Boat, Submarine, or in its German Translation, Underboot, was a deciding factor of the 6 year campaign. It would often require a crew of 35 men and would use wolf and fangs tactics to target convoys to Britain. A good movie to watch for such example is the German Film, Das Boot.