The order of the War Department directing me to report in person to the general commanding in East Tennessee was issued on the 2nd of December. [Footnote: Official Records, vol. xxxi. pt. iii. p. 314.] It was to take effect when I should have completed my duties at Sandusky, but as I had pressed all my work forward to completion some days before, in the expectation of the order, I was prepared to leave at once. A copy of the order was telegraphed to me on the 3rd, and I left for Cincinnati the same evening. On reaching the district and department headquarters, I learned that Burnside was relieved, and that General Foster had passed through the city, going on toward East Tennessee to assume command of the department. Longstreet raised the siege of Knoxville the very day I reached Cincinnati, but this was not yet known, and several days passed before we had authentic information that the way to Knoxville was open. There was work to do in closing up the business of the district, packing papers and books pertaining to my headquarters, and providing for their safe-keeping. A number of officers belonging to Burnside's command were waiting an opportunity to rejoin the army, and I arranged a rendezvous for these at Lexington, Ky., where I would join them. A small troop of cavalry was detailed to act as our escort, and the quartermaster's department promised wagons for our baggage and supplies. On the 8th the news of Longstreet's retreat indicated that the road through Cumberland Gap to Knoxville was probably open, and sending our horses and baggage to Lexington by railroad, I left Cincinnati with my staff on Wednesday, the 9th, for the same place. Reaching there at evening, the next day was spent in packing our wagons and organizing our little party, and the cavalcade marched out of the pretty town of Lexington early on the 11th.