Leonardo da Vinci’s multi-barrel cannon design arranged 33 barrels in one firing system.
The weapon is commonly called Leonardo’s organ gun because its parallel rows of small cannons resemble the pipes of a musical organ. The design was intended to fire a broad volley of projectiles, then be repositioned or reloaded. Multiple barrels could provide greater short-term firepower than a single cannon.
The 33-barrel weapon was a proposal, not a battlefield system documented as having been deployed by Leonardo. It belongs to his broader studies of military engineering, which included fortifications, bridges, artillery, and armored vehicles. The design is often confused with later volley guns, but the defining numerical detail in Leonardo’s sketch is the arrangement of 33 barrels.