Field artillery in the American Civil War
Field artillery in the American Civil War were cannon that could be moved around the battlefield or could travel with an army unit. Field artillery could only fight unlimbered (disconnected from the cart and horses that pulled it). The limber (or caisson) along with the team of six horses would be moved to a safe area nearby. Gun crews were organized into an artillery battery, six guns (later in the war, four) were deployed along a line about  wide with the guns spaced about  apart.