 By the evening of 6 July, the Voronezh Front had committed all of its reserves, except for three rifle divisions under the 69th Army; yet it could not decisively contain the 4th Panzer Army. The XLVIII Panzer Corps along the Oboyan axis, where the third defensive belt was mostly unoccupied, now had only the Red Army second defensive belt blocking it from breakthrough into the unfortified Soviet rear. This forced the Stavka to commit their strategic reserves to reinforce the Voronezh Front: the 5th Guards and 5th Guards Tank Armies, both from the Steppe Front, as well as the 2nd Tank Corps from the Southwestern Front. Ivan Konev objected to this premature piecemeal commitment of the strategic reserve, but a personal call from Stalin silenced his complaints. In addition, on 7 July Zhukov ordered the 17th Air Army – the air fleet serving the Southwestern Front – to support the 2nd Air Army in serving the Voronezh Front. On July 7, the 5th Guards Tank Army began advancing to Prokhorovka. 5th Guards Tank Army commander, Lieutenant General Pavel Rotmistrov, described the journey:
