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The pause in British operations while Plumer moved more artillery into the area of the Gheluvelt plateau, helped to mislead the Germans, Albrecht von Thaer, Staff Officer at Group Wijtschate wrote that it was "almost boring". At first, Kuhl doubted that the offensive had ended but by 13 September, had changed his mind and despite reservations allowed two divisions, thirteen heavy batteries and twelve field batteries of artillery, three fighter squadrons and four other air force units to be transferred from the 4th Army.
German defensive changes: late 1917
Instead of setting objectives 1–2 miles (1.6–3.2 km) distant as on 31 July, the British planned an advance of approximately 1,500 yards (1,400 m), without the disadvantages of rain soaked ground and poor visibility encountered in August. The advances were much quicker and the final objective was reached a few hours after dawn, which confounded the German counter-attack divisions. Having crossed 2 miles (3.2 km) of mud, the Eingreif divisions found the British already established along a new defence line, with the forward battle zone and its weak garrison gone beyond recapture. After the Battle of the Menin Road Ridge, the German defensive system was changed, beginning a resort to expedients which lasted for the rest of the battle. In August, German front-line divisions had two regiments of three battalions each deployed forward, with the third regiment in reserve. The front battalions had needed to be relieved much more frequently than expected, due to the power of British attacks, constant artillery fire and the weather, which caused replacement units to become mixed up with ones holding the front, rather than operate as formed bodies. Reserve regiments had not been able to intervene early enough, leaving front battalions unsupported until Eingreif divisions arrived, some hours after the commencement of the attack.
After another severe defeat on 26 September, the German commanders made more changes to the defensive dispositions of the infantry and altered their counter-attack tactics, which had been negated by Plumer's more conservative form of limited attacks.
