"Operation Overlord" was the code name for the invasion of which country?

Operation Overlord was the code name for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied Western Europe during World War II. The operation was launched on 6 June 1944 with the Normandy landings (Operation Neptune, commonly known as D-Day). A 1,200-plane airborne assault preceded an amphibious assault involving more than 5,000 vessels. Nearly 160,000 troops crossed the English Channel on 6 June, and more than two million Allied troops were in France by the end of August.

The Allies failed to accomplish their objectives for the first day, but gained a tenuous foothold that they gradually expanded when they captured the port at Cherbourg on 26 June and the city of Caen on 21 July. A failed counterattack by German forces on 8 August left 50,000 soldiers of the 7th Army trapped. The Allies launched an invasion of southern France (code-named Operation Dragoon) on 15 August, and the Liberation of Paris followed on 25 August. German forces retreated across the Seine on 30 August 1944, marking the close of Operation Overlord.

The beaches of Normandy are still known by their invasion code names. Significant places have plaques, memorials, or small museums, and guide books and maps are available. Some of the German strong points remain preserved. Several large cemeteries in the area serve as the final resting place for many of the Allied and German soldiers killed in the Normandy campaign.