Lord George Murray was a respected Jacobite commander whose father, the Duke of Atholl (chief of Clan Murray) in fact supported the British Government. Lord George opposed all of these views and proposed that half of their force should stay at Brampton while the other half besieged Carlisle. James Drummond, 3rd Duke of Perth supported Murray's opinion and offered to take charge of the force to attack Carlisle if Murray took command of the blockade. The attacking party left the main body of the Jacobite army in Brampton, cutting down wood in Corby and Warwick parks to make scaling ladders and carriages.