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In page Battle of Rzhev, Summer 1942:

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After its initial breakthrough, 31st Army had achieved a steady but unspectacular advance in its sector against German infantry, pushing them back step by step, and inflicting a steady drain on German resources but suffering greatly itself. By 23 August it captured one of the main objectives of the offensive, taking the southern half of Zubtsov. Then, its units reached the river Vazuza and carved out a shallow bridgehead on the western bank.[2] Konev took the 6th Tank out from 20th Army and put it back in the line just below Zubtsov utilizing 31st Army's bridgehead. The attack was planned for 9 September, when sufficient ammunition had been brought up.