 Živojin Mišić's 1st Army and the "Armée d'Orient" performed a night attack on the Gradešnica fortified zone, suppressing the defenders.The 1st Division Group moved into a position on the Poroi river north of Brahovo in conjunction with the Timok Division.By the night of 16 September, the gap in what formerly constituted the front-line had extended to in width and in depth.