Twice I've published the animal requirements for a British Flying Artillery Troop [Battery/Company] during the Battle of Waterloo, it was some 225 mules/horses for 6 guns, the smallest organic unit of artillery.
Now, check this occurrence:
October 12, 1862 Tuesday
BGen. Herbert Marshall's command departing Kentucky for Virginia, following Perryville, has to hold up for Kirby Smith's army to pass.
"He (Smith) gave Genl. Marshall permission to take his command & go out by way of Pound Gap . . . we left Lancaster a little after one & came on to the X roads at Chas. J. Farrands (where I am now writing this) formerly of Danville K'y. where we stopped to let 20 miles of wagons pass.
"The rear of this immense train which has been passing this point in one continuous solid stream since Sunday night 12.M. just passed at night."
(Davis, William C. & Swentor, Meredith L., Editors, The Headquarters Diary of Edward O. Guerrant, Bluegrass Confederate, Louisiana State University Press, Baton Rouge, 1999, pp. 160/1