On 19 November, the Red Army launched Operation Uranus, a two-pronged attack targeting the weaker Romanian and Hungarian armies protecting the 6th Army's flanks. The Axis flanks were overrun and the 6th Army was cut off and surrounded in the Stalingrad area. Adolf Hitler was determined to hold the city at all costs and forbade the 6th Army from attempting a breakout; instead, attempts were made to supply it by air and to break the encirclement from the outside. Heavy fighting continued for another two months. At the beginning of February 1943, the Axis forces in Stalingrad, having exhausted their ammunition and food, surrendered after five months, one week and three days of fighting.