Invading German troops approach Bydgoszcz. Poland, September 18, 1939. Photograph »

View of the entrance to a marketplace reduced to rubble as a result of a German aerial attack. Warsaw, Poland, September 1939. Photograph »

Poles walk among the ruins of besieged Warsaw. Photograph »

German soldiers in the Soviet Union during a December 1943 Soviet offensive on the eastern front. German troops invaded Soviet territory in June 1941 but faced counteroffensives following the battle of Stalingrad. December 16, 1943. Photograph »

A German army column struggles through the mud, past a destroyed Soviet tank. Nevel, Soviet Union, fall 1943. Photograph »

British troops land on the beaches of Normandy on D-Day, the beginning of the Allied invasion of France to establish a second front against German forces in Europe. Normandy, France, June 6, 1944. Photograph »

British troops land on the beaches of Normandy on D-Day, the beginning of the Allied invasion of France to establish a second front against German forces in Europe. Normandy, France, June 6, 1944. Photograph »

US troops wade ashore at Normandy on D-Day, the beginning of the Allied invasion of France to establish a second front against German forces in Europe. Normandy, France, June 6, 1944. Photograph »