On this day in 1941, Nazi Germany initiated Operation Barbarossa, the largest military invasion in history. The operation marked the beginning of the Eastern Front in World War II, involving a massive German offensive into the Soviet Union. This surprise attack violated the Molotov-Ribbentrop Pact, a non-aggression agreement between the two nations. The invasion encompassed a vast territory and deployed over three million Axis soldiers against the Soviet forces. Initial German advances were swift, inflicting significant casualties and territorial gains. However, the Soviet Union’s vast size, harsh winters, and eventual counteroffensives ultimately stalled and reversed the German advance, leading to a brutal and protracted conflict. Operation Barbarossa proved to be a turning point in World War II, with devastating consequences for both nations and the wider world.