Although long overshadowed in the West by the dropping of the atomic bombs on Hiroshima and Nagasaki, the USSR's lightning strike into Manchuria in August 1945 was one of the most successful and unique campaigns of the era. Soviet forces, led by over 5,500 tanks and self-propelled guns, attacked across huge distances and deserts, marshes, and mountains to smash Japan's million-strong Kwantung Army in a matter of days.