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Much of the new digging on the rest of the Western Front was done on reverse slopes, invisible to ground observers and capable of being engaged only by howitzer-fire. The French methods of attack had been made obsolete by the time of the resumption of the offensive in September 1915, when many French troops were killed on such slopes, in front of uncut wire, before an undamaged second position. French sources put casualties from 3 May to 18 June at 102,500 of whom 35,000 men were killed; another 37,500 casualties were incurred in secondary operations. The German official historians of the Reichsarchiv recorded c. 102,500 French casualties from 9 May –to18 June, 32,000 British casualties and 73,072 German casualties. Sheldon recorded the same figures for French casualties, quoting the French Official History and c. 30,000 casualties for the German divisions most involved in the battle (1st and 5th Bavarian Reserve divisions, 3rd Bavarian, 5th, 11th, 15th, 16th and 115th divisions) noting that some figures are estimates believed to be too low but that the total was far fewer than French losses. In 2013 Krause recorded ranges of 100,000–121,000 French and 50,000–80,000 German casualties. The battle had great influence on the French army during the preparations for the autumn offensive of 1915 in Champagne and Artois, which were also based on an assumption that strategic victories were possible after one or two days of offensive action. Joffre ordered another 5,500 machine-guns, to double the number per brigade by 1 January 1916. Production of the 240 mm Trench Mortar (240 mm (9.4 in)) and 340 mm (13 in) trench mortar was increased and manufacture began of artillerie lourde à grande puissance (ALGP, long range heavy guns); production of 75 mm ammunition was reduced to increase quality and large orders were placed for aircraft and for gas shells. The growth of French war production by September 1915, enabled the French to attack in two places simultaneously.
At the end of June, Joffre discussed strategy with the army group commanders and Pétain, who had been promoted to the command of the Second Army. Foch again advocated a series of limited attacks, particularly in Artois where strategically important railways were relatively close behind the German lines.[j] Castelnau believed that it was still possible to advance through the German defences in one attack and that Champagne was a likely region for such an attempt, if the mistakes made on 9 May could be avoided. Pétain agreed with Foch but doubted that another offensive could quickly be prepared in Artois and was sceptical that any part of the Western Front was free of villages like Souchez and Neuville, which could be fortified and against which, only attacks even more limited than those advocated by Foch were practical. On 8 July, Joffre decided to make the principal attack in Champagne, with a supporting attack in Artois a few days earlier to attract German reserves.
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