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.”
This aticle is primarily excerpts from the history of the 2nd Regiment of Artillery by its regimental adjutant, First Lieutenant William Augustus Simpson (USMA Class of 1875), written ca. 1893 and published in Rodenbough, 1896:
"The Second Artillery was, with the First, Third, and Fourth, organized by an Act of Congress dated March 21, 1821. Each regiment was to have one colonel, one lieutenant-colonel, one major, one supernumerary captain (for ordnance duty), one adjutant, one sergeant-major, and nine companies. Each company was to have a captain, two first lieutenants, two second lieutenants, and fifty-seven enlisted men. One company was to be designated and equipped as light artillery, but for many years it was such only in name.
The list of organizations (given in the Army Register) from which these regiments were formed is misleading, as some of the organizations mentioned had been out of existence for years. The four regiments were formed from the Corps of Artillery, the Regiment of Light Artillery, and the Ordnance, the Second being taken mainly from the Corps of Artillery. All ordnance duty was to be done by the artillery.
There was a second regiment of artillery during the War of 1812, of which Winfield Scott was lieutenant-colonel and then colonel. After the war it was merged into the Corps of Artillery. The names of battles of that war are borne on the regimental colors to-day, a few of the officers of the new Second had belonged to the old, and some of the companies may have belonged to both regiments, a fact I am unable to establish; but as a whole the Second Artillery of 1812 was a different organization from the Second Artillery of 1821."
In 1821, Company A was formed from the remnants of the second battalion of the Northern Division of the old Artillery Corps. The new company was placed under the command of Captain Alexander Fanning, and was stationed on post at the U.S. Military Academy at West Point, New York.
The entire regiment was transferred to the South, exchanging stations with the 1st Regiment of Artillery. During the fall of 1833, Company A was sent to Alabama along with Companies B and C, and served under Colonel David E. Twiggs during the removal of the Creek nation of Native Americans out of the state.