By 17 August the encirclement was incomplete. The 1st Polish Armoured Division, part of the First Canadian Army, was divided into three battlegroups and ordered to make a wide sweep to the south-east to meet American troops at Chambois. Trun fell to the 4th Canadian Armoured Division on 18 August. Having captured Champeaux on 19 August, the Polish battlegroups converged on Chambois, and with reinforcements from the 4th Canadian Armoured Division, the Poles secured the town and linked up with the US 90th and French 2nd Armoured divisions by evening. The Allies were not yet astride the 7th Army escape route in any great strength, and their positions were attacked by German troops inside the pocket. An armoured column of the 2nd Panzer Division broke through the Canadians in St. Lambert, took half the village and kept a road open for six hours until nightfall. Many Germans escaped, and small parties made their way through to the Dives during the night.