ARTILLERY
Battery: usually 144 men with 4 guns and 2 howitzers, under a captain. Battalion: 3 to 4 batteries under a major. Regiment: 2 to 8 battalions under a colonel.
When infantry regiments are combined into brigades, brigades into divisions, and divisions into army corps,—cavalry, artillery, and certain other auxiliary troops, such as engineers, signal corps, etc., are joined with them in such proportions as are necessary. Every unit, from the company up, has its own supply and ammunition wagons, field hospitals, etc.