In artillery, chain-shot is an obsolete type of projectile formed of two sub-calibre balls, or half-balls, chained together. Bar shot is similar, but joined by a solid bar. They were used in the age of sailing ships and black powder cannons to shoot masts, or to cut the shrouds and any other rigging of a target ship.
When fired, after leaving the muzzle, the shot's components tumble in the air, and the connecting chain fully extends. In past use, as much as six feet of chain would sweep through the target. However, the tumbling made both bar and chain shot less accurate, so they were used at shorter ranges.
Chain shot was sometimes used on land as an anti-personnel load. It was used by the defenders of Magdeburg in May 1631 as an anti-personnel load, which, according to counselor Otto von Guericke, was one reason for the extreme violence of the victorious attackers. It was also used against the 76th Highlanders in India in 1803, against Union troops at the battle of Gettysburg in the American Civil War,, against Parliamentarians in the first English Civil War  and by the French against the Dutch at the Battle of Waterloo.
The military usefulness of chain shot died out as wooden sail-powered ships were replaced with armored steam ships—first among navies, and then among commercial fleets—which do not have rigging to serve as proper targets for chain-shot. Additionally, the conversion of naval armament from smoothbore, muzzle loaded, black powder cannons to rifled, breech loaded guns further slowed the production of new chain shot ammunition; the chain would damage barrels (degrading maximum range, and further degrading effective range by degrading accuracy), and the new breech loading guns and their ammunition were meant to be effective against armored vessels as well as wooden sailing vessels.
In modern times, the effect is replicated in shotguns with the use of bolo shells, a pair of slugs connected by a strong wire. They are banned in several jurisdictions, including Florida and Illinois.
In popular culture
Set in the age of sail, Patrick O'Brian's popular Aubrey–Maturin series, book 6, "The Fortunes of War," mentions that the Americans are using bar shot as characters plan for their encounter with the USS Constitution and later during the actual naval combat.
In the 2003 Disney feature film Pirates of the Caribbean: The Curse of the Black Pearl, chain-shot was used by the crew of the Black Pearl to disable the mast of the HMS Interceptor. It also was featured in the sequel Pirates of the Caribbean: At World's End to free the mast of the Black Pearl when it gets tangled with the mast of the Flying Dutchman
- This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.
- "Pirate Tech". Modern Marvels. 2006-07-09.
- Otto von Guericke: Geschichte der Belagerung, Eroberung und Zerstoerung von Magdeburg, 2. Auflage 1882, S. 16ff.
- John Clark Marshman: Abridgment of the History of India, 1873, p268
- Robert Tomes, John Laird Wilson, Battles of America by Sea and Land, 1878, p 524
- Anne Sacheverell, Daughters from London, 1643
- P. Wakker, Aanteekeningen van een Veteraan dato 16 Augustus 1815 (etc.), 1863, p. 14
- Statutes & Constitution :View Statutes : Online Sunshine
- Public Act 92-0423 of the 92nd General Assembly Archived March 13, 2007, at the Wayback Machine.