The larger operation, a phase of the Third battle of Ypres, was to begin on 16 August, with 60th and 61st brigades attacking north-east towards, around and past Langemarck, after the previous weeks losses 59th brigade, as division reserve, was reinforced with two battalions, 10th and 15th battalions, the Welch Regiment, from 38th (Welsh) Division. The 83rd and 84th engineer companies placed wooden bridges across the Steenbeek to allow the initial assaulting troops to form up on the east bank, and in spite of having to form up in some places within of German posts in front of the Au Bon Gite strong point, the build up on the east bank was achieved without the Germans being aware of the movement even while it was conducted through the 'usual' harassing, but undirected, artillery and machine gun fire. The three phase lines were a road through the west of Langmarck, the second a line east of the village and the third on a road junction about from the Steenbeek.