A mortar is today usually a simple, lightweight, man-portable, muzzle-loaded cannon, consisting of a smooth-bore metal tube fixed to a base plate with a lightweight bipod mount and a sight. Mortars are typically used as indirect fire weapons for close fire support with a variety of ammunition. Historically mortars were heavy siege artillery. Mortars launch explosive shells in high-arching ballistic trajectories.
United States Army soldiers firing an M120 mortar (round visible in smoke) during the War in Afghanistan
Engraving depicting the Venetian siege of the Acropolis of Athens, September 1687. The trajectory of the shell that hit the Parthenon, causing its explosion, is marked.
German 7.5 cm Minenwerfer
Wilfred Stokes with example of his WWI mortar and bombs
A muzzleloader is any firearm in which the user loads the projectile and the propellant charge into the muzzle end of the gun. This is distinct from the modern designs of breech-loading firearms, in which user loads the ammunition into the breech end of the barrel. The term "muzzleloader" applies to both rifled and smoothbore type muzzleloaders, and may also refer to the marksman who specializes in the shooting of such firearms. The firing methods, paraphernalia and mechanism further divide both categories as do caliber.
A "Brown Bess" muzzle-loading musket, used by the British Army from 1722 to 1838
Loaded muzzleloading cannon. (1) Priming charge (2) Main propellant charge (3) Wadding (4) Projectile (5) Wadding
Wadding recovered from the wreck of the packet ship Hanover and was found inside a loaded cannon, National Maritime Museum Cornwall (2014)
A pair of French rifled, flintlock, duelling pistols by Nicolas Noël Boutet 1794–1797. Royal Ontario Museum, Toronto, Canada. The set of accessories includes a small hammer as rifled pistols used slightly oversized bullets; a hammer was needed to drive the bullet down the barrel when loading.