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Nivelle agreed to a proviso that if the first two parts of the operation failed to lead to a breakthrough, they would be stopped so that the British could move their main forces north for the Flanders offensive, which Haig argued was of great importance to the British government. Haig wrote on 23 January that it would take six weeks to move British troops and equipment from the Arras front to Flanders and on 14 March he noted that the attack on Messines Ridge could be made in May. On 21 March, he wrote to Nivelle that it would take two months to prepare the attacks from Messines to Steenstraat but that the Messines attack could be ready in 5–6 weeks. On 16 May, Haig wrote that he had divided the Flanders operation into two phases, one to take Messines Ridge and the main attack several weeks later. British determination to clear the Belgian coast took on more urgency after the Germans resumed unrestricted submarine warfare on 1 February 1917. On 1 May 1917, Haig wrote that the Nivelle Offensive had weakened the German army but that an attempt at a decisive blow would be premature. An offensive at Ypres would continue the wearing-out process, on a front where the Germans could not refuse to fight. Even a partial success would improve the tactical situation in the Ypres salient, reducing the exceptional "wastage" which occurred even in quiet periods. In early May, Haig set the timetable for the Flanders offensive, with 7 June the date for the preliminary attack on Messines Ridge. Ypres is overlooked by Kemmel Hill in the south-west and from the east by a line of low hills running south-west to north-east. Wytschaete (Wijtschate) and Hill 60 are to the east of Verbrandenmolen, Hooge, Polygon Wood and Passchendaele (Passendale).
お礼
わかりやすくありがとうございました。 writeについて調べてみると write A that B で Aに手紙でBについて知らせるとありました。 「この文の前」をみてなるほどと納得しました。