A military operation involving the forceful entry into enemy territory, often by land, sea, or air. Major invasions, such as the Normandy landings, were defining moments of World War II, shaping the course of the war.

Enemy Action

Any act of aggression or hostility committed by opposing forces.


A period of combat or fighting between opposing forces.

Amphibious Assault

A military operation involving the landing of troops and equipment from the sea onto a hostile shore, usually with the support of naval gunfire and air power. Key tactic used by Allied forces in World War II.


A German military operation in northern Greece during World War II.