The Earl of Argyll, on his part, retired to Inverary and sent his followers home. He felt secure in the mighty barrier of mountains around, which in summer offered a terrible route to an army, but which, now blockaded with snow, he deemed impregnable. But he was deceived; the retirement of Montrose was a feint. He was busily employed in rousing the northern clans to a sweeping vengeance on Argyll, and the prospect of a rich booty. In the middle of December he burst through all obstacles, threaded the snow-laden defiles of the mountains, and descended with fire and sword into the plains of Argyleshire. The earl was suddenly roused by the people from the hills, whose dwellings were in flames behind them, and only effected his escape by pushing across Loch Fyne in an open boat. Montrose divided his host into three columns, which spread themselves over the whole of Argyleshire, burning and laying everything waste. Argyll had set a price upon Montrose's head; and Montrose now reduced his splendid heritage to a black and frightful desert. The villages and cottages were burnt down, the cattle destroyed or driven off, and the people slain wherever found with arms in their hands. This miserable and melancholy state of things lasted from the 13th of December to the end of January, 1645. Argyll by that time had mustered the Clan Campbell, and Lord Seaforth the mountaineers of Moray, Ross, Sutherland, and Caithness, to bear down on the invaders. Montrose, therefore, led forth his Highlanders and Irish to encounter them, and came first on Argyll and his army at Inverlochy Castle, in Lochaber. There he totally defeated Argyll, and slew nearly fifteen hundred of his people. This success brought to his standard the clan Gordon and others. The whole north was in their power, and they marched from Inverlochy to Elgin and Aberdeen. At Brechin they were met by Baillie with a strong force, which protected Perth; but Montrose marched to Dunkeld, and thence to Dundee, which he entered, and began plundering, when Baillie arrived with his Covenanters and caused him to retire. Once more he escaped to the mountains, but this time not without severe losses, for his indignant foes pursued him for threescore miles, cutting off many of his soldiers, besides those that had perished in the storming of Dundee. When he appeared again it was at Auldearn, a village near Nairn, where, on the 9th of May, he defeated the Covenanters (under John Urry or Hurry) after a bloody battle, two thousand men being said to be left upon the field.