They soon reached Ukraine and had reached Kiev by late August. In September, Rudniev formed a partisan group in Putyvl. In October, Rudniev and Sydir Kovpak's partisan detachment united into one unit, with Rudniev becoming commissar.
They quickly arrived in Ukraine and reached Kiev by late August. By September, Rudniev established a guerrilla group in Putyvl. In October, Rudniev combined his partisan detachment with Sydir Kovpak's unit into one force, with Rudniev taking on the role of commissar.