The Battle of Normandy was fought in 1944 between Nazi Germany in Western Europe and the invading Allied forces as part of the larger conflict of World War II. Operation Overlord was the codename for the Allied invasion of northwest Europe, which began on June 6, 1944, and ended on August 19, 1944, when the Allies crossed the River Seine. Over sixty years later, the Normandy invasion still remains the largest seaborne invasion in history, involving almost three million troops crossing the English Channel from England to Normandy.
The primary Allied formations that saw combat in Normandy came from the United States of America, United Kingdom and Canada. Substantial Free French and Polish forces also participated in the battle after the assault phase, and there were also contingents from Belgium, Czechoslovakia, Greece, the Netherlands, and Norway.
The Normandy invasion began with overnight parachute and glider landings, massive air attacks, naval bombardments, and an early morning amphibious phase began on June 6. The “D-Day” forces deployed from bases along the south coast of England, the most important of these being Portsmouth. The battle for Normandy continued for more than two months, with campaigns to establish, expand, and eventually break out of the Allied beachheads, and concluded with the liberation of Paris and the fall of the Falaise pocket in late August 1944.