4. =Montrose and Argyle. 1644.=--For the present, however, the two parties could not afford to quarrel, as a powerful diversion in the king's favour was now threatening them from Scotland. The Marquis of Montrose, who, in the Bishops' Wars, had taken part with the Covenanters, had grown weary of the interference of the Scottish Presbyterian clergy with politics, and still more weary of the supremacy in Scotland of the Marquis of Argyle, who had all the organisation of the Presbyterian Church at his disposal. Montrose saw that, though Argyle was too strong for him in the Lowlands, it was possible to assail him with effect in the Highlands, where he had made many enemies. In the Lowlands Argyle was regarded as a Scottish nobleman. In the Highlands he was the chief of the clan of the Campbells, which had often unscrupulously extended its borders at the expense of its neighbours, especially at the expense of the various clans of the Macdonalds. Montrose therefore hoped that if he threw himself into the Highlands, he might make use of the enmity of these clans against the Campbells to crush Argyle and to exalt the king. 5. =Montrose in the Highlands. 1644-1645.=--In =1644=, shortly after the battle of Marston Moor, Montrose made his way to the Highlands with only two followers. He was the first to discover the capacity of the Highlanders for war. With their help, and with the help of a trained Irish contingent, mostly composed of the descendants of Highlanders who had emigrated to Ireland, he beat the Scottish forces at Tippermuir and Aberdeen, and then, crossing the mountains, amidst the snows of winter, harried the lands of the Campbells. On February 2, =1645=, he defeated Argyle's clansmen at Inverlochy, whilst Argyle himself--who was no warrior--watched their destruction from a boat. Wherever Montrose went the heavy Lowland troops toiled after him in vain. On May 9 he overthrew another army under Baillie at Auldearn. Leven's Scottish army in Yorkshire had enough to do to bar the way against Montrose in case of his issuing from the mountains and attempting to join forces with Charles in England. With any other troops Montrose would probably have made the attempt already; but his Highlanders were accustomed to return home to deposit their booty in their own glens as soon as a battle had been won, and, therefore, victorious as he had been, he was unable to leave the Highlands.