page_title: Armies in the American Civil War
section_title: Siege artillery
hierarchical_section_title: Armies in the American Civil War / Weapons / Siege artillery
caption_attribution_description: Drawing of casemate carriage for a Columbiad, US Civil War period
context_page_description: This brief survey is by no means exhaustive, but it should give enough material to have a better understanding of the capabilities of the forces that fought the American Civil War. Understanding these capabilities should give insight into the reasoning behind the decisions made by commanders on both sides.
context_section_description: The 1841 artillery system listed eight types of siege artillery and another six types as seacoast artillery. The 1861  Ordnance Manual included eleven different kinds of siege ordnance. The principal siege weapons in 1861 were the 4.5-inch rifle; 18-, and 24-pounder guns; a 24-pounder howitzer and two types of 8-inch howitzers; and several types of 8- and 10-inch mortars. The normal rate of fire for siege guns and mortars was about twelve rounds per hour, but with a well-drilled crew, this could probably be increased to about twenty rounds per hour. The rate of fire for siege howitzers was somewhat lower, being about eight shots per hour.
  The carriages for siege guns and howitzers were longer and heavier than field artillery carriages but were similar in construction. The 24-pounder model 1839 was the heaviest piece that could be moved over the roads of the day. Alternate means of transport, such as railroad or watercraft, were required to move larger pieces any great distance.
  The rounds fired by siege artillery were generally the same as those fired by field artillery, except that siege artillery continued to use grapeshot after it was discontinued in the field artillery (1841). A "stand of grape" consisted of nine iron balls, ranging from two to about three and one-half inches in size depending on the gun caliber.
  The largest and heaviest artillery pieces in the Civil War era belonged to the seacoast artillery. These large weapons were normally mounted in fixed positions. The 1861 system included five types of columbiads, ranging from 8- to 15-inch; 32- and 42-pounder guns; 8- and 10-inch howitzers; and mortars of 10- and 13-inches.
  Wartime additions to the Federal seacoast artillery inventory included Parrott rifles, ranging from 6.4-inch to 10-inch (300-pounder). New columbiads, developed by Ordnance Lieutenant
  Thomas J. Rodman, included 8-inch, 10-inch, and 15-inch models. The Confederates produced some new seacoast artillery of their ownBrooke rifles in 6.4-inch and 7-inch versions. They also imported weapons from England, including 7- and 8-inch Armstrong rifles, 6.3-tol2.5-inch Blakely rifles, and 5-inch Whitworth rifles.
  Seacoast artillery fired the same projectiles as siege artillery but with one addition - hot shot. As its name implies, hot shot was solid shot heated in special ovens until red-hot, then carefully loaded and fired as an incendiary round.
caption: Drawing of casemate carriage for a Columbiad, US Civil War period.
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