Воронежский фронт
In June 1942, Operation Blau saw Hoth's Fourth Panzer Army thrust in full force against 40th Army, which had its headquarters overrun by 24th Panzer Division on 29–30 June. The 40th Army fell back from the Kastornoye area back to Voronezh, alongside the 4th, 17th, and 24th Tank Corps. In response, the STAVKA hastened to establish the new Voronezh Front. During July, 40th Army, subordinated to Voronezh Front, was assigned to defend the river Don along the Liski - Pavlovsk sector, positions that it held throughout the remainder of 1942.