英文を日本語訳して下さい。
Fresh troops from the unengaged brigades of the attacking divisions or from the reserve divisions would then pass through, to attack the Oosttaverne line at zero + 10:00 hours. As soon as the black line was captured, all guns were to bombard the Oosttaverne line, conduct counter-battery fire and place a standing barrage beyond the black line. All operational tanks were to join with the 24 held in reserve, to support the infantry advance to the Oosttaverne line.The Messines defences were on a forward slope, overlooked from Haubourdin Hill (Hill 63) south of the Douve valley and Kemmel Hill, 5,000 yards (4,600 m) west of Wijtschate, an arrangement which the experience of 1916 showed to be obsolete. A new line incorporating the revised principles of defence derived from the experience of the Battle of the Somme, known as Flandern I Stellung, was begun in February 1917. The first section began 6 miles (9.7 km) behind Messines Ridge, running north from the Lys to Linselles then Werviq and Beselare, where the nearest areas giving good artillery observation to the west were found. In April, Field Marshal Crown Prince Rupprecht and his chief of staff, Lieutenant-General Hermann von Kuhl, favoured withdrawal to the Warneton (third) line, before a British attack. The local divisional commanders objected, due to their belief that counter-mining had neutralised the British underground threat and the inadequacy of the Warneton line. The convex eastern slope limited artillery observation and the Ypres–Comines canal and the river Lys restricted the space below the ridge where infantry could manoeuvre for counter-attacks. British observation from the ridge would make the ground to the east untenable as far as Flandern I Stellung 6 miles (9.7 km) beyond.
