Кавказский фронт
After the evacuation 51st Army joined the North Caucasian Front at Kuban. In July, Marshal Budenny received orders to combine the Southern Front and North Caucasian Front into a single formation retaining the title of North Caucasian Front, and 51st Army joined the 'Don group' of that front under General Lieutenant Rodion Malinovsky, along with the 12th Army and the 37th Army. On 22 July, army commander Major general Nikolai Trufanov was relieved of command. As part of the Stalingrad Front (from 1–5 August), then briefly with the Southeast Front (from 6 August until 27 September), and then back with the Stalingrad Front it took part in the Battle of Stalingrad. On 31 July when it came under Stalingrad Front control it was so worn down by its previous rough handling that it was only 3,000 men strong. It was attacked on the same day by the 4th Panzer Army, which was able to break through.