Henri-Joseph Paixhans (; January 22, 1783, Metz – August 22, 1854, Jouy-aux-Arches) was a French artillery officer of the beginning of the 19th century. Henri-Joseph Paixhans graduated from the École Polytechnique. He fought in the Napoleonic Wars, was the representative (Député) for the Moselle department between 1830 and 1848, and became "General de Division" in 1848. In 1823, he invented the first shell guns, which came to be called Paixhans guns (or "canon-obusiers" in the French Navy). Paixhans guns became the first naval guns to combine explosive shells and a flat trajectory, thereby triggering the demise of wooden ships, and the iron hull revolution in shipbuilding. Paixhans also invented a "Mortier monstre" ("Monster Mortar"), using 500 kg bombs, which was used to terrible effect in the Siege of Antwerp in 1832. He was also a naval theorist claiming that a few aggressively armed small units could destroy the largest naval units of the time, making him a precursor of the French "Jeune École" school of thought. The poet Victor Hugo wrote: "Terre! l'obus est Dieu, Paixhans est son prophète." ("Earth! the shell is God, Paixhans is his Prophet.") Paixhans naval guns Paixhans developed a delaying mechanism which, for the first time, allowed shells to be fired safely in high-powered flat-trajectory guns. The effect of explosive shells hitting wooden hulls and setting them aflame was devastating, and was demonstrated in trials against the two-decker Pacificateur in 1824. The first Paixhans guns were founded in 1841. The barrel of the guns weighed about 10,000 pounds, and proved accurate to about two miles. In the 1840s, France, England, Russia and the United States had adopted the new naval guns. The effect of the guns in an operational context was first demonstrated during the actions at Eckernförde in 1849 during the First Schleswig war, and especially at the Battle of Sinop in 1853 during the Crimean War. Legacy Ironclad warships Wooden boats became so vulnerable that the only possible response could come with the introduction of the iron-hulled warship. The first of them was the French La Gloire, which was a wooden ship with iron sheathing. She was soon followed by HMS Warrior, which was iron-hulled with wooden backing. Further developments Paixhans's design was later improved by the American John A. Dahlgren, who wrote: Floating batteries A class of floating batteries named after Paixhans was developed by Henri Dupuy de Lôme. Four of these