High Quality Content by WIKIPEDIA articles! For this article, “Company A” and “Battery A” are interchangeable. A battery of four to six cannons, with two to three two-cannon sections was the basic unit of the artillery branch. The organization was commanded by a captain with first and second lieutenants as section chiefs and chief of caissons. A battery organization was roughly company strength, as it related to the infantry branch. As such, the formal designation of an artillery battery by the U.S. Army was “company.”