Operation Overlord: This was the codename for D-Day - the largest amphibious invasion in history which involved landing thousands of troops on Normandy beaches in France.
Battle of Stalingrad: A major turning point on the Eastern Front where Soviet forces successfully defended their city against German invaders. It weakened the German army and marked a shift in momentum.
Battle of the Bulge: A major German offensive in December 1944 that aimed to split Allied forces, but ultimately failed. It was the last major Nazi offensive on the Western Front.