once valenciennes surrendered on 17 march, luxembourg moved against cambrai. on 22 march, 7,000 locally conscripted peasants began digging lines of circumvallation and contravallation and on 30 march, french siege artillery commenced bombardment of the walls. by 3 april, the breach was large enough to assault and they quickly captured the selles and notre dame gates; the city surrendered on 5 april, although the citadel still held out.