Henri-Joseph Paixhans (French pronunciation: ?[p?ks?~]; 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.
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.")