During World War II (1941–45) Ural became the industrial backbone of Russia as most important industrial enterprises were evacuated there from the western Russia occupied by Germans. From the summer to winter of 1941, 667 factories were moved to Ural and by the end of 1941 Ural accounted for 62% of the Soviet iron production. The Ural's industrial production increased 3 times in 1943 relatively to 1941 and the military production increased 6 times. During the war, Ural accounted for 40% of the Soviet military production. Three Ural's plants gave 66% of Soviet tanks and mobile artillery units. The annual increase of production was about 50%. In 1946, most plants were converted into non-military directions.