After this exploit the Master of Sinclair returned to the camp at Perth, there to promote, if not actually to originate, divisions which were fatal to the cause which he had espoused. Lord Mar, in his letters, charges him, indeed, distinctly with being the very source of the dissensions which soon sprang up among the Jacobite chiefs.[231] The temper of Sinclair could ill brook submission to the Earl of Mar, whom, as a General, he soon ceased to respect; and for whose difficult situation he had no relenting feelings. "The Master," writes Sir Walter Scott, "who was a man of strong sense, acute observation, and some military experience, besides being of a haughty and passionate temper, averse to deference and subordination, soon placed himself in opposition to the general, whom he seems to have at once detested and despised."[232] The unfortunate result of the siege of Preston, soon brought to light the discontents which the Master had nourished among the followers of Mar. Parties had, indeed, for some time agitated the camp. When the disasters in England gave them a fresh impulse, and Lord Mar feelingly, and perhaps not too severely, described the influence of Sinclair when he bitterly describes him as "a devil in the camp, known in his true colours when calamity had befallen those with whom he was in conjunction." It was henceforth in vain that Mar, to use his own expression, "endeavoured to keep people from breaking among themselves until the long-expected arrival of the Chevalier should, it was hoped, check the growing jealousies in the camp;" a party arose, headed by Lord Huntley, Lord Seaforth, and the Master of Sinclair, who soon obtained the name of the Grumbler's Club, and who rendered themselves odious to the sincere and zealous Jacobites. Lord Huntley appears from Lord Mar's representations, "to have been completely under the influence of the Master." "Lord Huntley," writes Lord Mar, "is still very much out of humour, and nothing can make him yet believe that the King is coming. He intends to go north, under the pretext of reducing Lord Sutherland, and his leaving us at this time, I think, might have very bad effects, which makes me do all I can to keep him. The Master of Sinclair is a very bad instrument about him, and has been most to blame for all the differences amongst us. I am plagued out of my life with them, but must do the best I can."[233] Lord Huntley, however, continued to manifest the greatest disgust and suspicion of Lord Mar, often refusing to see him, and, though still lingering at Perth, threatening continually to leave the camp and go northward.