The Battle of Stalingrad (1942-1943) : The Soviet Union scored a significant win with this one, which launched their Eastern Front counteroffensive against the Germans.
The Battle of Midway (1942) : The Pacific War's turning point was this naval conflict between the United States and Japan. The US was successful in taking control of the Pacific and destroying a sizable chunk of the Japanese fleet.
The D-Day invasion (1944) : The Allies were able to gain a foothold in Western Europe thanks to this significant Allied invasion of France's Normandy, which ultimately resulted in the defeat of Nazi Germany.
The Battle of Kursk (1943) : This was the largest tank fight in history, and the Soviet Union won it handily on the Eastern Front. As a result, Germany was ultimately defeated on the Eastern Front.
The dropping of atomic bombs on Hiroshima and Nagasaki (1945) : This was a controversial decision by the United States, but it ultimately led to Japan's surrender and the end of World War II.