A little further along Battery Irwin is what I think is a 5-inch gun, in that it sure seems bigger than the 3-inchers, though all the documentation I can find says that Irwin only sported the 3-inchers. These were re-installed in 1946 as "saluting guns," to use to scare the crap out of passing ships by making violent, sudden noises...maybe that turned out to be so much fun that a 5-incher was added for even more shorts-soiling fun.