By November 1942, the Soviets had begun to repulse the important German strategic southern campaign and, although there were 2.5 million Soviet casualties in that effort, it permitted the Soviets to take the offensive for most of the rest of the war on the Eastern Front. Germany attempted an encirclement attack at Kursk, which was successfully repulsed by the Soviets. By the end of 1943, the Soviets occupied half of the territory taken by the Germans from 1941 to 1942. Soviet military industrial output also had increased substantially from late 1941 to early 1943 after Stalin had moved factories well to the east of the front, safe from German invasion and aerial assault.