I Corps crossed the Yperlee from the north-west of Bixschoote to north of the Drie Grachten bridge-head and drove the Germans out of part of the swampy Poesele peninsula but numerous pillboxes built in the ruins of farmhouses further back were not captured. The French crossed the upper Steenbeek from west of Weidendreft to a bend in the stream south-west of St Janshoek. Keeping pace with the British, they advanced to the south bank of the Broombeek. Mondovi blockhouse held out all day and pivoting on it, the Germans counter-attacked during the night of to get between the French and British. The attack failed and the next morning the troops on the army boundary had observation across the narrow Broombeek valley. Apart from resistance at Les Lilas and Mondovi blockhouses, the French had achieved their objectives of 16 August relatively easily. The German garrisons at Champaubert Farm and Brienne House held out until French artillery deluged them with shells, which induced the garrisons to surrender thirty minutes later. The French took more than numerous guns, trench mortars and machine-guns.