Near the fort's gate and facing the river to the south are Batteries Hentig and Dodd. These mounted smaller-caliber, rapid-firing guns that were intended to support underwater electrical cables and minefields, and were named for Captain Edmund C. Hentig of the 6th US Cavalry, who died fighting injuns in 1881; and Captain Albert Dodd of the 17th US Infantry, who died at the Battle of Gaines Mill in 1862.

Both of these batteries are roped off, but are close enough to the ground that one can peer inside.