Cyril Falls, The History of the 36th (Ulster…
“ It was to attack with three divisions in line: from right to left the 36th (Ulster) Division, the 16th (Irish) Division, and the 19th (Western) Division. These troops were to advance to the Black Line, east of the Messines-Wytschaete Road, after which the 11th Division, in Corps Reserve, was to pass through to the final objective. A glance at the map will show how the frontage [85] of attack narrowed with every thousand yards of the advance. On the right of the 36th Division was the 25th, in the II. Anzac Corps. ”
