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Operation Overlord
Part of World War II
Tank landing ships unloading on Omaha Beach
Date 6 June – mid-July 1944 Location Normandy, France Result Decisive Allied victory
Belligerents
Allies  United States  United Kingdom  Canada Free French Forces Free Polish Forces  Australia Free Belgian Forces  New Zealand  Netherlands  Norway Free Czechoslovak Forces Kingdom of Greece	Axis  Nazi Germany
Commanders and leaders
Dwight Eisenhower (Supreme Allied Commander) Arthur Tedder (Deputy Supreme Allied Commander) Bernard Montgomery (21st Army Group, Ground Forces Commander in Chief) Trafford Leigh-Mallory (Air Commander in Chief) Bertram Ramsay (Naval Commander in Chief) Omar Bradley (U.S. 1st Army) Miles Dempsey (British 2nd Army)	Gerd von Rundstedt (Oberbefehlshaber West) Erwin Rommel (Heeresgruppe B) Friedrich Dollmann (7.Armee Oberkommando)   †
Strength
1,332,000 (by July 24)	380,000 (by July 23)
Casualties and losses
July 24: ~120,000 casualties	July 24: 113,059 casualties

Operation Overlord was the 1944 campaign for the invasion of continental Europe in World War II. It was fought by the Allied forces against German forces. The most critical part was the Normandy landings, which were to get the Allied armies onto the mainland of Europe. That might have failed, and heavy casualties were expected, even if it succeeded.