This was supported by 4th Panzer Army which attacked Stalingrad's southern suburbs. Driving forward, they sought to capture the heights of Mamayev Kurgan and reach the main landing area along the river. Engaged in bitter fighting, the Soviets fought desperately for the hill and the No. 1 Railroad Station. Receiving reinforcements from Yeryomenko, Chuikov battled to hold the city. Understanding the German superiority in aircraft and artillery, he ordered his men to stay closely engaged with the enemy to negate this advantage or risk friendly fire. Uniting at Kalach on November 23, the Soviet forces successfully encircled 6th Army trapping around 250,000 Axis troops. To support the offensive, attacks were conducted elsewhere along the Eastern Front to prevent the Germans from sending reinforcements to Stalingrad. Though the German high command wished to order Paulus to conduct a breakout, Hitler refused and was convinced by Luftwaffe chief Hermann Goring that 6th Army could be supplied by air. This ultimately proved impossible and conditions for Paulus' men began to