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The armies were to capture Passchendaele Ridge and advance on Roulers and Thourout, to cut the railway supplying the German garrisons holding the Western Front north of Ypres and the Belgian coast. An attack by the Fourth Army would then begin on the coast, combined with Operation Hush (including an amphibious landing) in support of the main advance to the Netherlands frontier. On 13 May, Haig appointed General Hubert Gough to command the Ypres operation and the coastal force; Macmullen gave Gough the GHQ 1917 plan the next day.
Entente offensive preparations
Gough held meetings with his Corps commanders on 6 and 16 June where the third objective of the GHQ 1917 plan, which included the German Wilhelm Stellung (third line), was added to the first and second objectives to be taken on the first day. A fourth objective was also given for the first day but was only to be attempted opportunistically, in places where the German defence had collapsed. Gough intended to use five divisions from the Second Army, nine divisions and one brigade from the Fifth Army and two divisions from the French First Army (1re Armée). Gough planned a preparatory bombardment from 16–25 July. The Second Army was to create the impression of a more ambitious attack beyond Messines Ridge, by capturing outposts in the Warneton line. The Fifth Army was to attack along a front of approximately 14,000 yards (13,000 m), running from Klein Zillebeke in the south to the Ypres–Staden railway in the north, with the French First Army on the northern flank attacking with two divisions, from the boundary with the XIV Corps north to the flooded area just beyond Steenstraat. The infantry trained on a replica of the German trench system, built using information from aerial photographs and trench raids. Specialist platoons were given additional training on methods to destroy German pillboxes and blockhouses.
The attack was not a breakthrough attempt, for the German fourth-line defensive position (the Flandern I Stellung), lay 10,000–12,000 yards (9,100–11,000 m) behind the front line, well beyond the fourth objective (red line).
お礼
回答ありがとうございます。 やはりリンク先の回答が間違っていたのですね。 これでsecond to last含めて納得できました。