With defeats at El-Alamein and Stalingrad, as well as the landing of U.S. troops in North Africa by the end of 1942, the tide of the war turned against Germany.
As the conflict continued, Hitler became increasingly unwell, isolated and dependent on medications administered by his personal physician.
Several attempts were made on his life, including one that came close to succeeding in July 1944, when Col. Claus von Stauffenberg planted a bomb that exploded during a conference at Hitler's headquarters in East Prussia.
Within a few months of the successful Allied invasion of Normandy in June 1944, the Allies had begun liberating cities across Europe. That December, Hitler attempted to direct another offensive through the Ardennes, trying to split British and American forces.
But after January 1945, he holed up in a bunker beneath the Chancellery in Berlin. With Soviet forces closing in, Hitler made plans for a last-ditch resistance before finally abandoning that plan.