Though initially successful, the German attacks stalled in the face of Soviet reinforcements brought in from across the Volga. The Soviet 13th Guards Rifle Division, assigned to counterattack at the Mamayev Kurgan and at Railway Station No. 1, suffered particularly heavy losses. Over 30 percent of its soldiers were killed in the first 24 hours, and just 320 out of the original 10,000 survived the entire battle. Both objectives were retaken, but only temporarily. The railway station changed hands 14 times in six hours. By the following evening, the 13th Guards Rifle Division had ceased to exist.