These arguments, as we have already hinted, found something responsive in Montrose’s own bosom, not quite consonant with the general heroism of his character. The houses of Argyle and Montrose had been in former times, repeatedly opposed to each other in war and in politics, and the superior advantages acquired by the former, had made them the subject of envy and dislike to the neighbouring family, who, conscious of equal desert, had not been so richly rewarded. This was not all. The existing heads of these rival families had stood in the most marked opposition to each other since the commencement of the present troubles.
Montrose, conscious of the superiority of his talents, and of having rendered great service to the Covenanters at the beginning of the war, had expected from that party the supereminence of council and command, which they judged it safer to intrust to the more limited faculties, and more extensive power, of his rival Argyle. The having awarded this preference, was an injury which Montrose never forgave the Covenanters; and he was still less likely to extend his pardon to Argyle, to whom he had been postponed. He was therefore stimulated by every feeling of hatred which could animate a fiery temper in a fierce age, to seek for revenge upon the enemy of his house and person; and it is probable that these private motives operated not a little upon his mind, when he found the principal part of his followers determined rather to undertake an expedition against the territories of Argyle, than to take the far more decisive step of descending at once into the Lowlands.