It will he recalled by those who have read "Butler's Book," that in addition to a number of trivial derelictions of duty, General Smith was charged with the more serious one of having failed through negligence and an untimely cessation of operations, to capture Petersburg, when it was claimed that all the conditions were favorable to success. It should also be recalled that several weeks after this failure had taken place and all the necessary explanations had been made and considered, the President had, on Grant's recommendation, relieved Butler from further service in the field and had assigned General Smith to the command of the Eighteenth Corps which was composed of the troops from Butler's department, serving with the Army of the Potomac. It should be remembered at the same time that before General Smith received this order he had applied for and been granted leave of absence on account of illness, or as he explained, "because of his old trouble with his head," and that while he was absent, the Lieutenant General was by some means never fully or satisfactorily explained, induced to restore Butler to his former command and to dispense entirely with the services of General Smith. In reply to a letter from Smith, he authorized Colonel Comstock of his staff to inform him that he had been relieved "because of the impossibility of his getting along with General Butler," who was his senior in rank. But General Grant assured me about this time that it was with great regret that he had taken this action; that he had tried in vain to utilize Smith's great talents; that he had been too free in his criticisms, and that Smith himself had made it necessary that either he should be relieved or that Meade, Burnside and Butler should he deprived of command and sent out of the army. Some conversation followed, in which it was suggested that he should have given the preference to the alternative as a means of simplifying the organization and increasing the efficiency of the army, and it is a singular coincidence at least, that this suggestion was partly carried into effect, with most excellent results, by the relief of both Butler and Burnside, shortly afterwards, from the command of troops in that theatre of operations. It has besides long been a question among military men whether still better results would not have been obtained if Grant had at the same time relieved Meade, who was certainly a most competent and loyal general, from the immediate command of the Army of the Potomac and placed him instead at the head of an army corps.