What is a cannon that is short in proportion to its bore, designed for firing shells at high angles?

A mortar is a type of cannon that is specifically designed to fire projectiles, typically shells, at high angles. This is achieved through its relatively short barrel in relation to its bore size. When mortars are fired, they launch shells in a high arc, allowing them to reach targets that might be sheltered or behind obstacles, such as buildings or fortifications. Mortars are generally used in indirect fire roles, providing support for infantry and other units on the battlefield.

The primary characteristic that distinguishes a mortar from other artillery pieces is its ability to place indirect fire effectively over a short range with high angles of elevation. This design enhances its utility in combat situations where a more direct line of sight cannot be maintained.

In contrast, options like a missile and bazooka refer to guided and portable anti-tank weapons, respectively, which do not share the same characteristics or functions as a mortar. A cannon, in a more general sense, might describe any large-caliber firearm but lacks the specific features associated with high-angle fire of mortars. Thus, the mortar is the appropriate choice given its specialized design and purpose in military operations.