The guns on the first floor of Fort Pulaski fired through these little windows. The architecture here was quickly proven ineffective once the battle started. The assumption had been that since there couldn't be an artillary assault on the fort, attacking troops would have to swarm the island where Fort Pulaski stands and mount a close-range assault. The guns could then fire horizontally and take out troops on the ground right outside the fort. The new Union cannons meant this assault never actually had to take place. These interior guns couldn't elevate to increase their range, so they proved useless.