Without going into elaborate detail it is worth while to notice his plan for reducing the Highlands. The Royalist forces and their Highland allies were gathered together principally in two districts, in Lochaber under Glencairn, and in Sutherland under Middleton. Monk's design was to cut the Highlands in twain along the line of the present Caledonian Canal, that he might pen his enemy at his will into either half of the country thus divided, and deal with his forces in detail. North of this line the country was sufficiently circumscribed by nature; south of it he was compelled to fix his own boundaries. The east and south was already guarded by a strong chain of posts running from Inverness through Stirling to Ayr, while one corner to the south-west was secured by the neutrality of the Campbells, which had been gained by diplomacy. Monk now established three independent bases of operations, one at Kilsyth to southward, two more at Perth and Inverness. He then left one column at Dingwall, under Colonel Thomas Morgan, an officer of whom we shall hear more, to hinder the junction of Middleton and Glencairn; and arranged that another column, under Colonel Richard Brayne, of whom also we shall hear more, should sail with all secrecy from Ireland and seize Inverlochy, which was to be his fourth independent base to westward. This done he advanced himself with a third column into the hills from Kilsyth, attacked and defeated Glencairn, and closed the one gap in the net which he had drawn round the Highlands between Loch Lomond and the Clyde. Then hearing that Middleton had eluded Morgan and passed into Lochaber, he suddenly shifted his base to Perth and advanced into the heart of the mountains. In two days he had established an advanced magazine at Loch Tay, where the news reached him that the Northern clans had been summoned to assemble at Loch Ness. He at once gave orders that the enemy should be allowed to pass to the southward, and concerted a combined advance of himself, Brayne, and Morgan from the south-west and east to crush him. Unfortunately Morgan, in his eagerness to close in behind the Highlanders, arrived before them and headed them back again to northward. Monk, however, pursued them even thither, hunting them for a week from glen to glen by extraordinary marches, such as the Highlanders had not looked for from mere Englishmen.