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Control of Western rivers dictated strategic success in the Mississippi Valley.

Control of the Mississippi River system required developing specialized shallow-draft armored vessels capable of navigating narrow, shifting channels. James Eads constructed the initial fleet of ironclad gunboats at St. Louis, transforming civilian rivercraft into mobile artillery platforms. Securing these waterways severed Confederate supply lines and enabled Union armies to project power deep into Southern territory.

Combined army and naval actions reduced Forts Henry and Donelson.

Flag Officer Andrew Foote led ironclad gunboats down the Tennessee and Cumberland rivers to assault Confederate strongholds in early 1862. Direct naval gunfire compelled Fort Henry to surrender before army troops arrived to invest the position. At Fort Donelson, heavy Confederate shore batteries damaged the gunboats, but joint operations successfully trapped the Southern garrison.

Flotilla tactics cleared the upper Mississippi down to Memphis.

Mortar boats under Commander Henry Walke bombarded Island No. 10 while the gunboat Carondelet ran past enemy shore batteries under cover of a thunderstorm. This bold night passage allowed Union infantry to cross the river and cut off the Confederate garrison. Subsequent naval actions at Fort Pillow and Memphis destroyed the Confederate River Defense Fleet, opening the river to Vicksburg.

Deep-draft ocean warships forced the entrance to the lower Mississippi.

Flag Officer David Farragut breached the defenses below New Orleans by running his wooden steamships past Forts Jackson and St. Philip under heavy night fire. Chain boom obstructions and fire rafts failed to halt the Union fleet as ocean-going sloops overwhelmed Confederate river craft. The capture of New Orleans secured the river mouth and deprived the Confederacy of its largest commercial center.

Early attempts on Vicksburg exposed the limits of naval power alone.

Farragut advanced upriver from New Orleans while Davis pushed down from Memphis, meeting near Vicksburg in mid-1862. High bluffs prevented naval guns from neutralizing heavy Confederate fortifications crowning the heights. The sudden emergence of the ironclad CSS Arkansas highlighted the vulnerability of exposed wooden fleets operating without sustained army cooperation.

Joint operations and river runs forced the fall of Vicksburg.

Rear Admiral David Dixon Porter ran transports and ironclads past the Vicksburg batteries under blanket fire to ferry Grant's army south of the city. Naval mortars and gunboats maintained continuous bombardment during the long siege of Vicksburg and Port Hudson. The surrender of both posts in July 1863 restored unrestricted Union navigation from the Midwest to the Gulf of Mexico.

Engineering ingenuity saved the river fleet during the Red River campaign.

Admiral Porter's fleet accompanied General Banks up the Red River in 1864 but faced disaster when falling water levels trapped the heavy ironclads above the rapids at Alexandria. Lieutenant Colonel Joseph Bailey designed timber wing dams that raised the water level, allowing the trapped vessels to shoot the rapids safely. The campaign demonstrated how extreme water level fluctuations could undermine naval superiority on shallow tributaries.

Minefields and ironclads failed to block Mobile Bay's capture.

Farragut led fourteen wooden ships and four ironclad monitors past Fort Morgan to enter Mobile Bay in August 1864. Disregarding the underwater minefield after USS Tecumseh sank, Farragut pushed his fleet into the bay and forced the surrender of the heavy ironclad CSS Tennessee. Securing Mobile Bay closed the last major Gulf port available to Confederate blockade runners east of the Mississippi.

Book

The Gulf and Inland Waters

An analysis of Union naval strategy, river ironclads, and joint operations on Western waters during the Civil War.

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