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Since January French sappers in the Carency area had tunnelled 1.5 mi (2.4 km), to plant 30 long tons (30 t) of explosives in galleries under the German positions. The main French front of attack was from the chapel on the plateau of Notre Dame de Lorette Spur (Lorette spur) south to the "Labyrnthe", a network covering 2 sq mi (5.2 km2) of trenches, tunnels and dug-outs across the Arras–Lens road north of Ecurie and Roclincourt. The spur was the southern boundary of the plain north of the Béthune–La Bassée Canal, which was 6 mi (9.7 km) long and wooded in parts, except at the east end. From the north the slopes of the ridge were low but on the south side there were steep spurs separated by ravines. West of Ablain St. Nazaire (Ablain) was Spur Mathis and to the east, the Great Spur, the Arabs' Spur, the Spur of the White Way and the Spur of Souchez, which dominated the east edge of Ablain and the sugar refinery between Ablain and Souchez. By 20 March the French had worked their way up to the foot of the Great Spur and by 14 April had closed up to Ablain.
General d'Urbal was appointed to the command of the Tenth Army on 2 April, which had six infantry corps, a cavalry corps and three divisions in reserve. On the right (southern) flank was X Corps with the 19th and 20th divisions, the XVII Corps to the left with the 34th and 33rd divisions, XX Corps with the 11th and 39th divisions, XXXIII Corps with the Moroccan, 70th and 77th divisions, XXI Corps with the 13th and 43rd divisions and IX Corps with the 92nd Territorial Division and the 17th and 58th divisions, covering the ground up to the British First Army 15 mi (24 km) to the north. The IX Corps and XX Corps had been relieved by the British in Flanders and moved south from 9 to 16 April, although the IX Corps headquarters and the 18th, 152nd and 153rd divisions had to be rushed up to Flanders after the German gas attack at the Second Battle of Ypres (21 April – 25 May). Artillery reinforcements increased the quantity of heavy artillery to 293 guns and field artillery to 1,075 guns. Increased production of ammunition had not kept pace with demand and the French artillery remained short of high explosive shells; poor quality ammunition also caused a large number of premature detonations in French artillery. The Tenth Army was to attack on a 9.3 mi (15 km) front, the main attack being made in the centre by the XVII, XX and XXXIII corps on a 6.2 mi (10 km) front, with supporting attacks along the spur south of Bailleul Sire Berthoult and by the XXI Corps with two divisions along the Notre-Dame de Lorette spur. The main attack was to capture Vimy Ridge and then consolidate to prevent German counter-attacks from recapturing the heights.
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