I took the order to General Halleck, and said that I would like to accept, but he was not willing I should do so until the consent of the War Department could be obtained.  I returned to my tent much disappointed, for in those days, for some unaccountable reason, the War Department did not favor the appointment of regular officers to volunteer regiments, and I feared a disapproval at Washington.  After a further consultation with Captain Alger and Lieutenant Walbridge, I determined to go to the General again and further present the case.  Enlarging on my desire for active service with troops, and urging the utter lack of such opportunity where I was, I pleaded my cause until General Halleck finally resolved to take the responsibility of letting me go without consulting the War Department.  When I had thanked him for the kindness, he said that inasmuch as I was to leave him, he would inform me that the regiment to which I had just been appointed was ordered out as part of a column directed to make a raid to the south of the enemy, then occupying Corinth, and that if I could turn over my property, it would probably be well for me to join my command immediately, so that I could go with the expedition.  I returned to my tent, where Alger and Walbridge were still waiting, and told them of the success of my interview, at the same time notifying them that I would join the regiment in season to accompany the expedition of which Halleck had spoken.

In the course of the afternoon I turned over all my property to my successor, and about 8 o’clock that evening made my appearance at the camp of the Second Michigan Cavalry, near Farmington, Mississippi.  The regiment was in a hubbub of excitement making preparations for the raid, and I had barely time to meet the officers of my command, and no opportunity at all to see the men, when the trumpet sounded to horse.  Dressed in a coat and trousers of a captain of infantry, but recast as a colonel of cavalry by a pair of well-worn eagles that General Granger had kindly given me, I hurriedly placed on my saddle a haversack, containing some coffee, sugar, bacon, and hard bread, which had been prepared, and mounting my horse, I reported my regiment to the brigade commander as ready for duty.