Any high wall for defense.
In fortification: an indented parapet, formed by a series of rising members called cops or merlons, separated by openings called crenelles or embrasures, the soldier sheltering himself behind the merlon while he fires through the embrasure or through a loophole in the battlement.
The towering roof of heaven.
A military unit, nominally headed by a colonel, equivalent to a USAF support wing, or an army regiment.
The troops stationed at such a post.
A permanent military post.
Occupants.
To convert into a military fort.
To occupy with troops.
To assign troops to a military post.