As the Ypres offensive bogged down, Second Army took over its direction in September. 66th HAG continued CB work, now as a double group with 35th HAG. The attack on Glencorse Wood and Nonne Boschen Wood by 1st Australian Division on 20 September supported by 66th HAG during the Battle of the Menin Road Ridge was successful because the objectives were limited and the heavy artillery support was overwhelming. 66th HAG's batteries continued their CB fire for I ANZAC Corps' attack on Gheluvelt on 4 October (the Battle of Broodseinde).