Torpedoes: The Navy's deadliest weapon

Torpedoes were the killing weapons of naval war, and much easier to aim than guns were. The art of gunnery, of firing projectiles at a moving target, entailed difficult calculations, including the problem of physically stabilizing guns on a rolling sea and the vagaries of three dimensions. Torpedo solutions were expressed in just two dimensions. If you knew your own torpedo's speed, it was s simple matter to trace the enemy's crossing angle and estimate the intersection point.
(from Neptune's Inferno, by James D. Hornfischer)


Torpedo wake