One of Walcher's councillors was Ligulf of Lumley, who was connected by birth to the old Northumbrian line and was married to the daughter of Ealdred, Earl of Bernicia. Ligulf's presence in the bishop's council provided a link with the local aristocracy. There was a Scottish invasion in 1079, which Walcher was unable or unwilling to deal with effectively. The Scots, under Malcolm III, were able to plunder Northumberland for about three weeks unopposed before returning to Scotland with slaves and booty. Ligulf was very critical of Walcher's conduct. A feud ensued between Ligulf and two of Walcher's henchmen, his chaplain Leobwin and his kinsman Gilbert. Gilbert attacked Ligulf's hall in the middle of the night and Ligulf and most of his household were killed.