There were actually more than six Allied nations that participated in the D-Day Invasion of the Normandy beaches on June 6, 1944. The United States, Great Britain and Canada provided the largest number of troops that fought against the German defenders.
UNITED STATES. American infantry troops were assigned to attack the beaches designated as Utah and Omaha as well as the heights of Pointe du-Hoc. The First Army troops totaled approximately 73,000 men. U. S. airborne and naval troops also participated.
GREAT BRITAIN. British troops assaulted the beaches at Sword, Juno and Gold. British Second Army troops numbered about 62,000 men. Naval and airborne troops also participated.
CANADA. The 3rd Canadian Infantry Division and 2nd Canadian Armored Brigade assaulted Juno Beach. Canadian airborne troops also parachuted inland. Total numbers were approximately 30,000 men.
AUSTRALIA. A small number of Australian officers were attached to British forces as observers, while as many as 3000 Australians were attached to British units.
NEW ZEALAND. Several thousand Kiwis served in the British Royal Navy and Air Force.
FRANCE. At least 500 Free French paratroopers participated in the invasion, and France contributed to the naval operations.
POLAND. Atleast three Polish naval ships were engaged on D-Day.
NORWAY. The Norwegian destroyer Svenner was sunk by German U-boats off Sword Beach, and several other Norwegian ships participated.
HOLLAND. At least three Dutch gunboatsparticipated in the naval attacks.
BELGIUM. Belgian paratroopers participated in airborne drops in the days before the invasion.