One of the forward attempts to construct immediate-ember artillery was the ribauldequin. It was a cart-mounted firing battery used in the 14th and 15th centuries. Because their many barrels resembled a pipe organ, ribauldequins became known as organ guns, and sometimes death organs. Far smaller caliber than cannons but larger than average guns, they played a supporting role in artillery bombardments.
Ribauldequins were expected to be on fire in rapid gaining when a declare yes connecting the append hole of all the barrels. Perhaps the largest were horse-drawn wagons back than three sets of guns re each side, which would have made for a sum of 144 guns that could be used against both infantry and armored cavalry. Unfortunately, taking into account these omnipotent gun batteries were deployed, their close weight got them stranded in the mud too often to be utterly useful.
RE: Strange Guns: Kel-Tec KSG