...ksburgh, commanding the department of the Tennessee, requiring me to detach one of my divisions to march to Vicksburgh, there to embark for Memphis, where it was to form part of an army to be sent to Chattanooga to reenforce General Rosecrans. I designated the First division, and at four P. M. the same day it marched for Vicksburgh, and embarked the next day. On the twenty-third of September, I was s...