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The captured ground was hard to move over and difficult to defend, as much of it was of the shell-torn wilderness left by the 1916 Battle of the Somme. Elsewhere the transport infrastructure had been demolished and wells poisoned during the German retreat to the Hindenburg Line in March 1917. The initial German jubilation at the successful opening of the offensive soon turned to disappointment as it became clear that the attack had not been decisive. Marix Evans wrote in 2002, that the magnitude of the Allied defeat was not decisive, because reinforcements were arriving in large numbers, that by 6 April the BEF would have received 1,915 new guns, British machine-gun production was 10,000 per month and tank output 100 per month. The appointment of Foch as Generalissimo at the Doullens Conference had created formal unity of command in the Allied forces. In the British Official History (1935) Davies, Edmonds and Maxwell-Hyslop wrote that the Allies lost c. 255,000 men of which the British suffered 177,739 killed, wounded and missing, 90,882 of them in the Fifth Army and 78,860 in the Third Army, of whom c. 15,000 died, many with no known grave. The greatest losses were to 36th (Ulster) Division, with 7,310 casualties, the 16th (Irish) Division, with 7,149 casualties and 66th (2nd East Lancashire) Division, 7,023 casualties. All three formations were destroyed and had to be taken out of the order of battle to be rebuilt. Six divisions lost more than 5,000 men. German losses were 250,000 men, many of them irreplaceable élite troops. German casualties, from 21 March – 30 April, which includes the Battle of the Lys, are given as 348,300. A comparable Allied figure over this longer period, is French: 92,004 and British: 236,300, a total of c. 328,000. In 1978 Middlebrook wrote that casualties in the 31 German divisions engaged on 21 March were c. 39,929 men and that British casualties were c. 38,512. Middlebrook also recorded c. 160,000 British casualties up to 5 April, 22,000 killed, 75,000 prisoners and 65,000 wounded; French casualties were c. 80,000 and German casualties were c. 250,000 men. In 2002, Marix Evans recorded 239,000 men, many of whom were irreplaceable Stoßtruppen; 177,739 British casualties of whom 77,000 had been taken prisoner, 77 American casualties and 77,000 French losses, 17,000 of whom were captured. The Allies also lost 1,300 guns, 2,000 machine-guns and 200 tanks. In 2004, Zabecki gave 239,800 German, 177,739 British and 77,000 French casualties. R. C. Sherriff's play Journey's End (first produced 1928) is set in an officers' dugout in the British trenches facing Saint-Quentin from 18 to 21 March, before Operation Michael. There are frequent references to the anticipated "big German attack" and the play concludes with the launch of the German bombardment, in which one of the central characters is killed.
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