The Brilliant Design of the Carronade

The video opens at Trafalgar, October 21st, 1805: as HMS Victory closes on the French flagship Bucentaure, a boatswain named William Wilmot fires a squat 68-pounder carronade through the enemy's stern windows, sending a heavy ball and a keg of 500 musket balls down the full length of the French gun deck and killing or wounding roughly 200 men in one shot. The video then explains how this weapon, weighing a fraction of an equivalent long gun, went from rejected experiment to the most feared close-range gun of the age of sail. Mid-1700s naval cannon had barely changed since the Mary Rose sank in 1545: a 32-pounder long gun weighed about three tons and demanded up to 14 crew. Scottish artillery officer Robert Melville asked whether a lighter, simpler gun could wreck ships at the short ranges where sea battles were actually decided, and partnered with Charles Gascoigne of the Carron Company ironworks on the River Carron near Falkirk. By around 1776 they produced the carronade: a short, light barrel using a quarter to a third of the powder, mounted on a sliding sled with a single under-barrel lug for a wide arc of fire. Precision boring based on John Wilkinson's horizontal lathe cut windage dramatically, and wool cartridges sped reloading; Patrick Miller's 1779 pamphlet promoted it to merchants. The Royal Navy distrusted it, but merchantmen facing privateers during the American Revolution adopted it eagerly. Proof came when the all-carronade HMS Rainbow under Captain Henry Trollope shattered the French frigate Hebe in minutes off Brittany in 1782, and Admiral Rodney's fleet used carronades devastatingly at the Battle of the Saintes, while France, having dismissed captured examples, could not match them for roughly 20 years. HMS Glatton out-hitted HMS Victory at close range, and Captain William Bligh commanded her at Copenhagen in 1801. Trafalgar marked the carronade's peak, but the USS Essex disaster at Valparaiso in 1814, where Captain David Porter's carronades were useless against Captain James Hillyar's long-range HMS Phoebe, exposed its fatal reliance on closing distance, and by the 1850s it vanished from most warships. The carronade got its name simply from the foundry that cast it, the Carron Company ironworks at Falkirk, and early on people called it the "smasher" for the damage it did at close quarters. It was the brainchild of General Robert Melville, son of a Scottish minister, who wanted a gun a merchant crew could actually handle, and Charles Gascoigne, who managed the works, brought the design to life in 1776 (rmg.co.uk/stories/maritime-history/what-was-carronade). The guns came in seven calibres, from 6-pounders up to the monstrous 68, and most sat on traversing slide carriages rather than wheeled trucks. The Rainbow's demolition of the Hebe in September 1782 was enough to convince the Admiralty, and by 1800 most upper-deck cannon across the Royal Navy had been swapped out for carronades. The frigate Diana, for instance, replaced her 9-pounders with 32-pounder carronades of the same weight in a 1796 refit (usni.org/magazines/naval-history-magazine/2023/december/carronades-smashers). The Americans took to them too, with Philadelphia's Eagle Foundry producing them from around 1799, and ships like the Constitution carried a full battery of 32-pounder carronades on her spar deck. Their one weakness showed at Valparaiso in 1814, where HMS Phoebe simply stood off and battered the Essex at ranges her carronades could never reach. By the 1820s the Paixhans shell gun and rifled artillery pushed naval fighting out past the smasher's reach, and the weapon faded from the fleet (usni.org/magazines/naval-history-magazine/2023/december/carronades-smashers).