英文翻訳をお願いします。
Before the action could be undertaken, a great deal of preparation was required, much of it innovative.After the Allied conference at Chantilly, Haig issued instructions for army commanders on 17 November 1916, with a general plan for offensive operations in the spring of 1917. The Chief engineer of the Third Army, Major-General E. R. Kenyon, composed a list of requirements by 19 November, for which he had 16 Amy Troops companies, five with each corps in the front line and one with XVIII Corps, four tunnelling companies, three entrenching battalions, eight RE labour battalions and 37 labour companies. Inside the old walls of Arras were the Grand and Petit places, under which there were old cellars, which were emptied and refurbished for the accommodation of 13,000 men. Under the suburbs of St Sauveur and Ronville were many caves, some huge, which were rediscovered by accident in October 1916. When cleared out the caves had room for 11,500 men, one in the Ronville system housing 4,000 men. The 8 ft × 6 ft (2.4 m × 1.8 m) Crinchon sewer followed the ditch of the old fortifications and tunnels were dug from the cellars to the sewer.
