Starvation and the bitter Russian winter took as many lives as the merciless Soviet troops, and on January 21, 1943, the last of the airports held by the Germans fell to the Soviets, completely cutting the Germans off from supplies. On January 31, Von Paulus surrendered German forces in the southern sector, and on February 2 the remaining German troops surrendered. Only 90,000 German soldiers were still alive, and of these only 5,000 troops would survive the Soviet prisoner-of-war camps and make it back to Germany.