Navigating through the smoke slowed progress, and the mistaken use by the First Canadian Army of yellow smoke to identify their positions—the same colour strategic bombers used to mark targets—led to some bombing of the Canadians and slower progress than planned. On 15 August, the 2nd and 3rd Canadian Infantry Divisions and the 2nd Canadian (Armoured) Brigade continued the offensive, but progress remained slow. The 4th Armoured Division captured Soulangy against determined German resistance and several German counter-attacks, which prevented a breakthrough to Trun. The next day, the 2nd Canadian Infantry Division entered Falaise against minor opposition from "Waffen SS" units and scattered pockets of German infantry, and by 17 August had secured the town.