The young Lord of the Isles was at the same time that Mackenzie went to Perth sent to Edinburgh, from which he soon afterwards escaped to the North, at the instigation of his mother, the Countess, raised his vassals, and, joined by all the outlaws and vagabonds in the country, numbering a formidable body of about ten thousand, he laid waste the country, plundered and devastated the crown lands, against which his vengeance was specially directed, razed the Royal burgh of Inverness to the ground, pillaged and burned the houses, and perpetrated every description of cruelty. He then besieged the Castle, but without success, after which he retired precipitately towards Lochaber, where he was met by the Royal forces, commanded by the King in person. The Lord of the Isles prepared for battle, but he had the mortification to notice the desertion of Clan Chattan and Clan Cameron, who had previously joined him, and of seeing them going over in a body to the Royal standard. The King immediately attacked the island chief and completely routed his forces, while their leader sought safety in flight. He was vigorously pursued, and finding escape or concealment equally impossible, and being reduced to the utmost distress, hunted from place to place by his vigilant pursuers, the haughty chief resolved to throw himself entirely on the mercy of His Majesty, and finding his way to Edinburgh in the most secret manner, and on the occasion of a solemn festival on Easter Sunday, in 429, at Holyrood, he suddenly appeared in his shirt and drawers before the King and Queen, surrounded by all the nobles of the Court, while they were engaged in their devotions before the High Altar, and implored, on his knees, with a naked sword held by the point in his hand, the forgiveness of his sovereign. With bonnet in hand, his legs and arms quite bare, his body covered only with a plaid, and in token of absolute submission, he offered his sword to the King. His appearance, strengthened by the solicitations of the affected Queen and all the nobles, made such an impression on His Majesty that he submitted to the promptings of his heart against the wiser and more prudent dictates of his judgment. He accepted the sword offered him, and spared the life of his captive, but immediately committed him to Tantallon Castle, under the charge of William Douglas, Earl of Angus. The spirit of Alexander's followers, however, could not brook this mortal offence, and the whole strength of the clan was promptly mustered under his cousin Donald Balloch, who led them to Lochaber, where they met the King's forces under the Earls of Mar and Caithness, killed the latter, gained a complete victory over the Royal army, and returned to the Isles in triumph, with an immense quantity of spoil.