In the centre, the I Corps (General Adolphe Guillaumat) captured the line from Prilip to Portes de Fer to Négotin in early October and on 7 October, the 40th Division captured Terplitz and Berlin trenches, formed a flank on the south-west fringe of St Pierre Vaast Wood and gained a small part of Reuss Trench (later lost). The 56th Division to the left managed to advance up the slope west of the Saillisels, captured Carlsbad Trench and gained a footing in the Bois Tripot strongpoint beyond, which gave the French observation of the ground towards the Péronne–Bapaume road and the Saillisels. The attack was the most successful on the north side of the Somme but fell far short of Rocquigny and on the left flank I Corps, which had been in the line since August, was relieved by the IX Corps (General H. F. A. Pentel) ready for the next attack on 12 October. On the right flank, the attack of the XXXIII Corps (General A. Nudant) south of Bouchavesnes from failed, due to an ineffective bombardment and offensive operations were suspended for the winter.