Thanks Alan, this is what I was looking for.
As far as the mileage, I have the same noted in Rick Bryant's post.
This T. J. Bullock was one of several men from near or in Columbia, Marion County who enlisted in the 12th. Miss. Infantry. If the Confederate goverment also picked up the expenses from Marion County to Brookhaven, the 360 miles noted in his records would be fairly accurate.