In the Union army the original allowance of 45 was reduced for some "flying" units to 20.
To give an idea as to how the number were apportioned, Halleck issued a general order setting the following standard:
9 wagons/1,000 men for luggage, camp equipage, etc.
7 wagons/1,000 men for subsistence, quartermaster, etc.
5 wagons/1,000 men for ordnance
2 wagons/1,000 (3/1,500) for medical supplies
Road conditions dictated the loading as did the condition of horses, thus the number of wagons required varied.
Four and six teams of horses/mules were the norm. Horses required some 26 pounds of food per day.
The logistics required were rather large and not often given much thought. The number men required for drivers, teamsters,
and foragers also reduced the ranks of rifleman.
Some additional titles of men assigned to a Confederate infantry regiment Quatermaster's and Commissary Departments were: Regimenal Blacksmith, Reg. Wagoner, Reg. Wagon Master, Reg. Forage Master, Reg. Teamster, Wagoners and Teamsters.
A good read on this subject is found in Edward Hagerman's "The American Civil War and the Origins of Modern Warfare, Ideas,
Organization, and Field Command," Indiana University Press, 1988/1992.
George Martin