Mantlet

A mantlet was a large shield or portable shelter used for stopping arrows or bullets, in medieval warfare. A mantlet could be mounted on a wheeled carriage and protected one or several soldiers. See also pavise.

A gun mantlet on an armoured fighting vehicle is an armour plate or shield attached to the vehicle's main gun or machine gun, protecting the opening through which the weapon barrel projects from the hull or turret armour. The main gun mantlet and glacis plate are usually the most heavily armoured parts of a tank or self-propelled gun.

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