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Plumer produced a revised plan, in which in the first stage, Messines and Pilckem ridges would be captured, with an advance some distance onto the Gheluvelt Plateau; soon afterwards, an attack would be made across the Gheluvelt Plateau, to Passchendaele and beyond. Plumer believed that a force of 35 divisions and 5,000 guns would be necessary, which was far greater than the amount of artillery in the BEF.
Haig also asked for an assessment from Colonel Macmullen on the General Headquarters staff, who proposed that the Gheluvelt Plateau be taken by a massed tank attack, reducing the need for artillery. In April, a reconnaissance by Captain Giffard LeQuesne Martel found that the area was unsuitable for tanks, because of narrow defiles between the three woods obstructing the approaches on the high ground and the broken state of the terrain. The tanks would have to detour north of Bellewaarde lake to Westhoek then wheel right at the German Albrecht Stellung. From mid-1917, the area east of Ypres was defended by six German defensive positions: the front line, Albrecht Stellung (second line), Wilhelm Stellung (third line), Flandern I Stellung (fourth line), Flandern II Stellung (fifth line) and Flandern III Stellung (under construction). In between the German defence positions lay the Belgian villages of Zonnebeke and Passchendaele. Plumer produced a second revision of his plan; Messines Ridge and the west end of the Gheluvelt Plateau would be attacked first and then Pilckem Ridge a short while later. The Fourth Army commander, General Henry Rawlinson proposed a plan to take Messines Ridge, then the Gheluvelt Plateau and Pilckem Ridge within 47–72 hours.
On 14 February after discussions with Rawlinson, Plumer and Haig, Macmullen submitted a memorandum which became the GHQ 1917 plan. On 7 May, Haig set the timetable for the preliminary attack on Messines Ridge (7 June) and the Flanders offensive some weeks later. A week after the Battle of Messines Ridge, Haig informed his army commanders that his objectives were to wear down the German army, secure the Belgian coast and connect with the Dutch frontier.
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