Having reduced the country beyond the Grampians ('benorth the Mounth'), Bruce descended upon Angus. Barbour says nothing of an attack on Brechin Castle, having already recorded its capture and the submission of Sir David to Bruce; but, as we have seen, Sir David was still--and, indeed, for several years to come--on the English side; and Barbour was evidently misinformed. Forfar Castle was taken by Philip the Forester, of Platter; the watch had not been vigilant, and Philip scaled the walls. Bruce demolished the castle; whether because it was of the old ineffective type, or because he had no means of holding it. He then, according to Barbour, invested Perth, which was strongly fortified, and was held by Moffat and Oliphant--Sir William Oliphant, the gallant defender of Stirling, who had been released from the Tower on May 24, 1308, having lain rusting there for nearly four years. The Earl of Strathearn, says Barbour, was also in the garrison, while his son and his men were in Bruce's camp; but Barbour is mistaken, for though Strathearn had been transferred from Rochester Castle to York Castle in the preceding November, he does not appear to have been released till November 18 of this year. Frequent skirmishes took place during a six weeks' siege, when Bruce suddenly decamped, amid the premature jeers of the garrison. After eight days he returned suddenly in the night, and, finding the English lulled in security, plunged into the moat up to his neck, mounted the walls by ladder, and surprised the sentinels. His men, dispersed in groups, gave the garrison no chance to marshal for effective defence. The English leaders were taken; but few men were slain, in consideration of their decent treatment of Scots. There was much booty for the victors. Bruce demolished the walls and the towers. 'Was none that durst him then withstand.' Whether this capture of Perth be fact or not--and probably it should be placed at a later date--Bruce now had the upper hand north of Forth.