Brief Description:  The medieval mortar was a short, wide-barreled siege weapon designed to lob heavy stones or explosive shells at steep, high-arching trajectories. It earned its name because its wide, bowl-like shape strongly resembled the kitchen and apothecary mortars used to grind materials. Developed in the mid-13th to 15th centuries, these early artillery pieces allowed armies to bypass thick fortress walls by dropping projectiles directly into enemy fortifications.

Key Design & Characteristics:

Barrel Shape: Uniquely short and wide (large caliber) with a thick-walled chamber at the base to contain the immense pressure of the gunpowder charge.

Mounting: Because they were fired at high angles to achieve a plunging arc, mortars were often mounted on heavy, fixed timber beds.

Portability: Early medieval mortars were massive, weighing thousands of pounds, and were virtually stationary once set up on a battlefield or siege site.

Stone Balls: Early medieval mortars fired heavy, quarried stone spheres that relied on sheer kinetic energy to smash through castle battlements or crush wooden structures.

Hollow Shells (Bombs): By the late medieval and early modern periods, mortars fired hollow cast-iron spheres filled with black powder. These served as early explosive shells, designed to rain deadly shrapnel down upon defenders.