The parade ground level of the Advance Redoubt is quite small. Its primary weapons were to be relatively small field artillery weapons, instead of the heavy seacoast cannon of the other Pensacola forts. Here you can see the firing locations for some of the field pieces along the inside of the scarp wall.
The Advance Redoubt, again like Fort Barrancas, has both scarp galleries, located below the parade ground level, and counterscarp galleries. The counterscarp galleries are located behind the counterscarp walls, which are the walls on the opposite side of the dry ditch from the main structure of the redoubt. This view shows the interior of a counterscarp gallery. 
Looking down the dry ditch toward the front of the fort, you can see the firing ports of both the scarp and counterscarp galleries. The larger embrasures in the center of the picture, which are sealed with red brick, were for flank defense howitzers. These small cannon would fire canister or grapeshot, which were loads consisting of multiple small cannonballs.Continue
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