On 19 November 1942, the Red Army launched Operation Uranus. The attacking Soviet units under the command of Gen. Nikolay Vatutin consisted of three complete armies, the 1st Guards Army, 5th Tank Army and 21st Army, including a total of 18 infantry divisions, eight tank brigades, two motorised brigades, six cavalry divisions and one anti-tank brigade. The preparations for the attack could be heard by the Romanians, who continued to push for reinforcements, only to be refused again. Thinly spread, deployed in exposed positions, outnumbered and poorly equipped, the Romanian 3rd Army, which held the northern flank of the German 6th Army, was overrun.