On June 6, 1944, over 160,000 Allied troops stormed five beaches along the Normandy coastline in Nazi-occupied northern France, marking the largest seaborne invasion in history. Codenamed Operation Overlord, the D-Day invasion involved airborne drops and naval bombardments to support the troops landing on the heavily fortified beaches, where over 9,000 Allied soldiers were killed or wounded that day. However, the invasion succeeded in gaining a foothold for the Allies in Normandy, marking a major turning point in the defeat of Nazi Germany in World War II.