次の英文を訳して下さい。
The main weight of attack was between Arras and a few kilometres south of St. Quentin, where the 18th Army had 27 divisions. Forty-four divisions were allocated to Operation Michael and called mobile divisions, which were brought up to full strength in manpower and equipment. Men over 35 years old were transferred, a machine-gun unit, air support and a communications unit were added to each division and the supply and medical branches were re-equipped but a chronic shortage of horses and fodder could not be remedied. Around the new year the mobile divisions were withdrawn for training according to Der Angriff im Stellungskriege und einige Verfügungen, die in den Erfahrungen über den Angriff ihren Niederschlag finden (The Offensive in Trench Warfare and Some Regulations that reflect Lessons Learned about the Offensive). Training emphasised rapid advance, the silencing of machine-guns and maintaining communication with the artillery, to ensure that infantry and the creeping barrage moved together. Infantry were issued with light machine-guns, mortars and rifle grenades and intensively trained. Thirty divisions were trained in the new tactics but had a lower scale of equipment than the elite divisions and the remainder were stripped of material to supply them, giving up most of their remaining draught animals. In the north, two German armies would attack either side of the Flesquières salient, created during the Battle of Cambrai. The 18th Army, transferred from the Eastern Front, planned its attack either side of St. Quentin, to divide the British and French armies. The two northern armies would then attack the British position around Arras, before advancing north-west to cut off the BEF in Flanders. In the south, it was intended to reach the Somme and then hold the line of the river against any French counter-attacks; the southern advance was extended to include an advance across the Somme. In the north, the Third Army (General Julian Byng), defended the area from Arras south to the Flesquières Salient. To the south, the Fifth Army held the line down to the junction with the French at Barisis.
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