mantlet

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mantlet

[′mant·lət]
(ordnance)
Protective shield or armor, as in front of a gun, or attached to the front of a tank.

chemise

A wall (often concentric with the keep) built around a medieval fortification of a bastion or keep.
References in periodicals archive ?
The crusaders also built a few catapults and balistae, and sent out every man, woman and child to bring light timber for the construction of ladders and mantelets, large shields to cover the attackers' advance to the wall.