The success of the German 4th Army in preventing the Fifth Army from advancing far along the Gheluvelt Plateau, led Haig to reinforce the offensive in the south-east, along the southern side of Passchendaele Ridge. Haig transferred principal authority for the offensive to the Second Army (General Herbert Plumer) on 25 August. Like Gough after 31 July, Plumer planned to launch a series of attacks with even more limited geographical objectives, using the extra heavy artillery brought in from the armies further south, to deepen and increase the weight of the creeping barrage. Plumer intended to ensure that the infantry were organised on tactically advantageous ground and in contact with their artillery, when they received German counter-attacks. Minor operations by both sides continued in September along the Second and Fifth army fronts, the boundary of which had been moved northwards, close to the Ypres–Roulers railway at the end of August.