The attack across the canal cutting, also known as the Battle of Bellenglise, saw IX Corps (commanded by Braithwaite), on the right of the American and Australian Divisions, launch its assault between Riqueval and Bellenglise. The assault was spearheaded by the British 46th Division under the command of Major-General Gerald Boyd. In this sector the St Quentin Canal formed an immense, ready-made anti-tank "ditch" and the main Hindenburg Line trench system lay on the east (German) side of the canal. IX Corps was supported by tanks of the 3rd Tank Brigade, which had to cross Bellicourt Tunnel in the American 30th Division sector and then move south along the east bank of the canal. IX Corps had to cross the formidable canal cutting (which increased in depth as it approached Riqueval until its very steep banks, strongly defended by fortified machine gun positions, were over deep in places), and then fight its way through the Hindenburg Line trenches. The 46th Division's final objective for 29 September was a line of high ground beyond the villages of Lehaucourt and Magny-la-Fosse. The British 32nd Division, following behind, would then leapfrog the 46th Division. Following a devastating artillery bombardment (which was heaviest in this sector), and in thick fog and smoke the 46th Division fought its way through the German trenches west of the canal and then across the waterway. The 137th (Staffordshire) Brigade spearheaded the attack.