Key Facts
- Duration
- 48 days (May 22 – July 9, 1863)
- Longest US siege to date
- Longest siege in US military history up to 1863
- Union commander
- General Nathaniel Banks
- Confederate commander
- General Franklin Gardner
- Strategic result
- Full Union control of the Mississippi River
Strategic Narrative Overview
Banks launched an assault on May 22, 1863, which failed against the fortified Confederate defenses. Unable to take the position by storm, he settled into a prolonged siege lasting 48 days—the longest in US military history to that point. A second direct assault also failed. Confederate General Franklin Gardner held the garrison, but news of Vicksburg's fall on July 4, 1863, left Port Hudson isolated and untenable.
01 / The Origins
By 1863, the Union sought to seize full control of the Mississippi River, which would split the Confederacy and cut off vital supply lines. Port Hudson, Louisiana, was the last major Confederate stronghold on the lower Mississippi. General Nathaniel Banks was ordered to capture it and then reinforce Ulysses Grant's simultaneous siege of Vicksburg further upriver, making Port Hudson a key objective in the Union's western strategy.
03 / The Outcome
With Vicksburg fallen, Gardner surrendered Port Hudson on July 9, 1863. The Union now controlled the entire length of the Mississippi River, fulfilling a central objective of the Anaconda Plan. Confederate territory east and west of the river was effectively severed, crippling Southern logistics and morale and opening the river to Union commerce from the Gulf of Mexico to the upper reaches.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Nathaniel Banks.
Side B
1 belligerent
Franklin Gardner.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.