On 19 June 93rd Siege Bty joined 10th HAG with Third Army, but was actually at rest until 11 July. Then on 11 July it switched to 33rd HAG, which was moving to Second Army in the Ypres Salient. From 1 August Second Army carried out operations in support of the Third Ypres Offensive. During the summer and autumn of 1917 the command of 93rd Siege Bty shifted constantly, though the heavy howitzers were moved less often. It was under 76th HAG from 24 August, 51st HAG from 27 August, 86th HAG from 5 September and 9th HAG from 22 September. Meanwhile, Fifth Army's Ypres offensive was making little progress, and Second Army took over its direction. The Battles of the Menin Road, Polygon Wood and Broodseinde were highly successful because of the weight of artillery brought to bear on German positions. But as the offensive continued with the Battle of Poelcappelle and First and Second Battles of Passchendaele, the tables were turned: British batteries were clearly observable from the Passchendaele Ridge and were subjected to counter-battery (CB) fire, while their own guns sank into the mud and became difficult to aim and fire.