The French made no attempts to intercept Charles. Troops under Jacques de Montgomery, Sieur de Lorges, sacked Lagny-sur-Marne, whose citizens had allegedly rebelled; but no attempt was made to engage the advancing Imperial army. Paris was gripped by panic, although Francis insisted that the population had nothing to fear. Charles finally halted his advance and turned back on 11 September. Henry, meanwhile, was personally directing the besiegers at Boulogne; the town fell in early September, and a breach was made into the castle on 11 September. The defenders finally surrendered a few days later.