Whilst these murmurs distracted the camp, immediately after the surrender of Carlisle, Lord George Murray resigned his commission of Lieutenant-General, and informed the Prince that thenceforth he would serve as a volunteer. Upon this step, Mr. Maxwell, who seems to have known intimately the merits of the case, makes the following temperate and beautiful reflection.[246] "It would be rash in me to pretend to determine whether ambition, or zeal for the Prince's service, determined Lord George to take this step; or, if both had a share in it, which was predominant: it belongs to the Searcher of hearts to judge of an action which might have proceeded from very different motives." Under these circumstances, violent discussions took place in the army; and the result was, the wise resolution on the part of a certain officer, not improbably Mr. Maxwell himself, to represent the consequences of these altercations to the Duke of Perth. The undertaking was one of delicacy and difficulty; but the individual who undertook it had not miscalculated the true gentlemanly humility, the real dignity and disinterestedness, of the gallant man to whom he addressed himself. The narrative goes on as follows: "A gentleman who had been witness to such conversation, and dreaded nothing so much as dissension in a cause which could never succeed but by unanimity, resolved to speak to the Duke of Perth upon this ungrateful subject. He had observed that those that were loudest in their complaints were least inclined to give themselves any trouble in finding out a remedy." "The Duke, who at this time was happy, but not elevated, upon his success, reasoned very coolly on the matter. He could never be convinced that it was unreasonable that he should have the principal command; but when it was represented to him, that since that opinion prevailed, whether well or ill founded, the Prince's affairs might equally suffer, he took his resolution in a moment; said he never had anything in view but the Prince's interest, and would cheerfully sacrifice everything to it. And he was as good as his word; for he took the first opportunity of acquainting the Prince with the complaints that were against him, insisted upon being allowed to give up his command, and to serve henceforth at the head of his regiment." After his resignation, the Duke of Perth sank gracefully into the duties of the post assigned to him. But his ardour in the cause was unsubdued; and he was frequently known, during the march from Carlisle to Derby, to ride down three horses a day when information of the enemy was to be procured. The short sojourn of the Prince at Derby, and the inglorious retreat, have been detailed by the various biographers and historians of that period; but, amongst the various accounts which have been given, that which is contained in a letter from Derby has not hitherto been presented to the reader, except in a collection rarely to be met with, and now but little known.[247]