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The Battle Zone was also usually organised in three defensive systems, front, intermediate and rear, connected by communication trenches and switch lines, with the defenders concentrated in centres of resistance rather than in continuous lines. About 36 of the 110 infantry and pioneer battalions of the Fifth Army held the Forward Zone. Artillery, trench mortars and machine-guns were also arranged in depth, in positions chosen to allow counter-battery fire, harassing fire on transport routes, fire on assembly trenches and to be able to fire barrages along the front of the British positions at the first sign of attack. Artillery positions were also chosen to offer cover and concealment, with alternative positions on the flanks and to the rear. About 2⁄3 of the artillery was in the Battle Zone, with a few guns further forward and some batteries were concealed and forbidden to fire before the German offensive began. The Germans chose to attack the sector around St. Quentin taken over by the British from February–April 1917, following the German withdrawal to the Hindenburg Line. Germany had begun construction of the Siegfried Stellung (Hindenburg Line) in September 1916, during the battle of the Somme. It stretched over 500 km (300 mi) from the Channel to the Moselle River and was built by Belgian and Russian prisoners of war. The strongest section was the salient at St. Quentin between Arras and Soissons. The line was 1.5 km (1 mi) deep with barbed wire in zig-zag lines of 15 m (50 ft), protecting three lines of trenches, interconnecting tunnels and strong points. In the rear were deep underground bunkers known as stollen (galleries) and artillery was hidden on reverse slopes. The Germans withdrew to this line in an operation codenamed Alberich over five weeks, during which time German High Command ordered a scorched earth policy. The ground abandoned in the retreat was laid waste, wells were poisoned, booby-traps laid and most towns and villages were destroyed. The attacking armies were spread along a 69-kilometre (43 mi) front between Arras, St. Quentin and La Fère. Ludendorff had assembled a force of 74 divisions, 6,600 guns, 3,500 mortars and 326 fighter aircraft, divided between the 17th Army (Otto von Below), 2nd Army (Georg von der Marwitz) of Heeresgruppe Kronprinz Rupprecht (Army Group Rupprecht of Bavaria) and the 18th Army (General Oskar von Hutier), part of Heeresgruppe Deutscher Kronprinz (Army Group German Crown Prince) and the 7th Army.
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