After successfully resisting multiple assaults and a 48 day siege, the Confederate garrison at Port Hudson, Louisiana surrendered on July 9, 1863, following the fall of Vicksburg days earlier.
One gun and a ram
The CSS Manassas, a one-gun Confederate ironclad ram, rammed the USS Richmond at the Head of Passes at the mouth of the Mississippi River on October 12, 1861. This letter (one page shown here), written by Johnny (possibly J.R. Bartlett), records the action from the Richmond’s deck and shows the damage done by the ram. As detailed in the notes, Richmond was damaged but not sunk, and Manassas suffered in the attack as well, losing its smokestack and prow and temporarily lost power.
Letter from Johnny Bartlett Regarding the Engagement Between the CSS Ram Manassas and the USS Richmond, 10/12/1861