"* ~4,000 tanks" . "\u2013 1,000,000+" . "Free Polish Forces" . . . "*" . "Free Norwegian Forces" . "Free Luxembourgish Forces" . "Western Allies:" . "* 2,200" . "French Resistance" . . "Free Greek Forces" . "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 commenced 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."@en . "Free French Forces" . "Free Dutch Forces" . "Operation Overlord"@en . . "* 4,101 planes" . . . "* 225,606 to 226,386 casualties" . "Free Belgian Forces" . "\u2013 ~2,300 tanks and assault guns" . . . . . "Decisive Allied victory" . "1944-08-30Z"^^ . "* 2,052,299 (by the end of August)" . . "* 380,000 troops (by 23 July)" . "* 1,452,000 troops (by 25 July)" . . . . "Free Czechoslovak Forces" .