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The rear edge of the German battle zone along the ridge, had been reinforced with machine-gun posts and the German divisional commanders decided to hold the front line, rather than giving ground elastically and few of the Eingreif divisions were needed to intervene in the battle. In 1939 Wynne wrote that the French lost 117,000 casualties including 32,000 killed in the first few days but that the effect on military and civilian morale was worse than the casualties. In the 1939 volume of Der Weltkrieg, the German official historians recorded German losses to the end of June as 163,000 men including 37,000 missing and claimed French casualties of 250,000–300,000 men, including 10,500 taken prisoner. In 1962, G. W. L. Nicholson the Canadian Official Historian, recorded German losses of c. 163,000 and French casualties of 187,000 men.[43] A 2003 web publication gave 108,000 French casualties, 49,526 in the Fifth Army, 30,296 casualties in the Sixth Army, 4,849 in the Tenth Army, 2,169 in the Fourth Army and 1,486 in the Third Army. In 2005, Doughty quoted figures of 134,000 French casualties on the Aisne from 16–25 April, of whom 30,000 men were killed, 100,000 were wounded and 4,000 were taken prisoner; the rate of casualties was the worst since November 1914. From 16 April – 10 May the Fourth, Fifth, Sixth and Tenth armies took 28,500 prisoners and 187 guns. The advance of the Sixth Army was one of the largest made by a French army since trench warfare began. The Battle of La Malmaison (Bataille de la Malmaison) (23–27 October) led to the capture of the village and fort of La Malmaison and control of the Chemin des Dames ridge. The 7th Army commander Boehn, was not able to establish a defence in depth along the Chemin-de-Dames, because the ridge was a hog's back and the only alternative was to retire north of the Canal de l'Oise à l'Aisne. The German artillery was outnumbered about 3:1 and on the front of the 14th Division 32 German batteries were bombarded by 125 French artillery batteries. Much of the German artillery was silenced before the French attack. Gas bombardments in the Ailette valley became so dense that the carriage of ammunition and supplies to the front was made impossible.
German retreat from the Chemin des Dames, November 1917
From 24–25 October the XXI and XIV corps advanced rapidly and the I Cavalry Corps was brought forward into the XIV Corps area, in case the Germans collapsed. On 25 October the French captured the village and forest of Pinon and closed up to the line of the Canal de l'Oise à l'Aisne. In four days the attack had advanced 6 miles (9.7 km) and forced the Germans from the narrow plateau of the Chemin des Dames, back to the north bank of the Ailette Valley. The French took 11,157 prisoners, 200 guns and 220 heavy mortars. French losses were 2,241 men killed, 8,162 wounded and 1,460 missing from 23–26 October, 10 percent of the casualties of the attacks during the Nivelle Offensive.
