Organ Gun (ETW Unit)
Thanks to its multiple barrels, an organ gun can fire devastating volleys all on its own.
Overview
An organ gun has several barrels that are fired, almost simultaneously, when the gunner applies the match. In theory, each barrel could be loaded with a different kind of projectile, although given the different ranges of, say, shot and canister, this would be wasteful. Only a suicidal or slightly mad artilleryman would use explosive shells. There is a good chance that the first shell would have exploded in its barrel before the last is prepared.
There has always been a tendency to make artillery pieces with more than one barrel. The great Leonardo da Vinci was among many to design a ribauldequin, or volley gun. As so often with artillery, the Ottoman Turks were ahead of European gunmakers in their work. They also persisted with producing organ guns after other nations had abandoned them. They also experimented with cannons of differing calibres, where a central barrel would be surrounded by small bore tubes cast into the main cannon wall. The French also flirted with a design for a triple-barrelled cannon early in the 18th Century, but it was heavy and offered no real advantages over three ordinary guns of the same calibre.