<P> Operation Overlord was the codename 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 . </P>
<P> Operation Overlord was the codename 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 . </P>
what was the code name for the d day invasion
what was the code name for the d day invasion
Operation Neptune
Operation Neptune