United States Navy (1861–1865)

United States Navy (1861–1865)
Name	United States Navy (1861–1865)
Country	United States
Period	American Civil War
Notable commanders	Gideon Welles, David Dixon Porter, David Farragut, Andrew Hull Foote, Samuel F. Du Pont, John A. Dahlgren, Louis M. Goldsborough, Stephen C. Rowan
Size	expansion from prewar fleet to wartime squadrons and brown-water flotillas
Battles	Battle of Hampton Roads, Battle of Forts Jackson and St. Philip, Siege of Vicksburg, Capture of New Orleans (1862), Battle of Mobile Bay, Peninsula Campaign, First Battle of Fort Wagner, Battle of Fort Sumter (1861)

United States Navy (1861–1865) The United States Navy during 1861–1865 was the maritime force of the Union that executed blockades, riverine campaigns, coastal assaults, and technological transitions that shaped American Civil War outcomes. Under Gideon Welles, the Navy expanded dramatically, engaging in actions from the Atlantic Ocean to the Mississippi River and participating in joint operations with the United States Army (Union), influencing later United States Navy doctrine and industrial policy.

Background and Organization at the Outset of the Civil War

At the outbreak of the American Civil War, the prewar fleet under Levi Woodbury-era funding and administration was small and divided among squadrons such as the North Atlantic Blockading Squadron, South Atlantic Blockading Squadron, East Gulf Blockading Squadron, and West Gulf Blockading Squadron, overseen by Secretary Gideon Welles and administered from Washington Navy Yard and the Bureau of Navigation (Navy) and Bureau of Ordnance and Hydrography. Senior officers included Louis M. Goldsborough and Montgomery C. Meigs-era contemporaries in logistics roles, while regional commands centered on ports like New York Harbor, Norfolk Navy Yard, Portsmouth Navy Yard, and Philadelphia Navy Yard. The Navy inherited steam vessels such as USS Merrimack (later CSS Virginia) and sail frigates like USS Constitution but faced shortages in ironclads, shallow-draft vessels for the Mississippi River and riverine theaters, and experienced manpower, prompting rapid commissioning and reorganization.

Naval Strategy and Missions (Blockade, Riverine Warfare, Coastal Operations)

Naval strategy emphasized the Anaconda Plan-style blockade enforced by the North Atlantic Blockading Squadron, South Atlantic Blockading Squadron, East Gulf Blockading Squadron, and West Gulf Blockading Squadron to strangle Confederate States commerce and logistics, while joint forces under leaders such as David Farragut, David Dixon Porter, and Andrew Hull Foote conducted combined operations at New Orleans (1862), Vicksburg Campaign, and the Peninsula Campaign. Riverine warfare on the Mississippi River involved brown-water flotillas like the Mississippi River Squadron and engagements including the Battle of Forts Jackson and St. Philip and Siege of Vicksburg to split the Confederacy, while coastal operations targeted fortifications such as Fort Sumter (1861), Fort Wagner, and Fort Pickens and key ports including Charleston, South Carolina, Savannah, Georgia, and Mobile, Alabama.

Fleet Composition and Technological Innovations (Ironclads, Steam Power, New Armaments)

Fleet composition evolved from wooden sailing frigates and sloops to steam-powered screw frigates, side-wheel steamers, and ironclad warships exemplified by vessels associated with the Ironclad Revolution such as USS Monitor, CSS Virginia, and Union ironclads like the USS New Ironsides and City-class ironclads. Innovations included rotary steam engines, screw propellers, turret designs pioneered by John Ericsson aboard USS Monitor, Dahlgren guns developed by John A. Dahlgren, and adaptable armor plating tested on ships at Norfolk Navy Yard and Mare Island Navy Yard-era facilities. Torpedo technology evolved into naval mines often called torpedoes by contemporaries, employing inventors and tinkerers linked to sites like Charleston Harbor and tested during actions such as the Battle of Mobile Bay and CSS Albemarle's engagements.

Major Campaigns and Battles (Merrimack/Monitor, Forts, Mississippi River, Blockade Actions)

Key engagements included the seminal duel at the Battle of Hampton Roads between USS Monitor and CSS Virginia that transformed naval architecture, the Capture of New Orleans (1862) led by David Farragut and Captain Percival Drayton against the Mississippi River defenses, and the Siege of Vicksburg where Ulysses S. Grant coordinated with David Dixon Porter's fleet. Blockade actions involved pursuits of blockade runners such as CSS Florida and CSS Alabama and operations culminating in the Battle of Mobile Bay against Confederate Navy defenses including Fort Morgan and ironclads like CSS Tennessee (1863). Rivers campaigns featured fights at Island No. 10, New Madrid, Missouri, and the capture of Fort Hindman (Arkansas Post) with notable joint actions by officers including William Tecumseh Sherman in coordination with naval forces.

Personnel, Command Structure, and Notable Officers

Personnel expansion drew sailors, marines, officers, and volunteers into service under Admirals and flag officers such as David Farragut, David Dixon Porter, Samuel F. Du Pont, Andrew Hull Foote, and innovators like John Ericsson and John A. Dahlgren. The Navy employed rating systems and bureaus including the Bureau of Steam Engineering and Bureau of Ordnance and Hydrography to manage professional staff, while figures like Gideon Welles directed policy from the Department of the Navy (United States). Notable junior officers and enlisted leaders included John L. Worden, Theodore D. F.-era contemporaries, and naval constructors linked to yards like Brooklyn Navy Yard and Portsmouth Navy Yard.

Logistics, Shipbuilding, and Industrial Support

Logistics and shipbuilding relied on northern industrial centers such as New York City, Philadelphia, Boston, Baltimore, and Middletown, Connecticut contractors, with ironworks like Morrison, Platt & Company-era suppliers producing armor and ordnance, and private yards such as New York Navy Yard and Mare Island Navy Yard augmenting federal facilities. Procurement of coal, shot, shell, and armor plate involved firms and inventors across the Industrial Revolution-era Northeast, while riverboat conversion programs leveraged commercial steamboat builders from Cincinnati, Ohio and St. Louis, Missouri to produce the City-class ironclads and tinclads for the Mississippi River Squadron.

Impact and Legacy (Postwar Reorganization and Influence on Naval Doctrine)

Postwar, lessons from actions at Hampton Roads, Vicksburg, and Mobile Bay influenced post‑Civil War reorganization of the Navy, catalyzing modernization debates within institutions such as the Naval War College and prompting procurement shifts toward armored, steam-powered fleets visible in later commissions like USS Maine (ACR-1) and doctrines advocated by reformers linked to Alfred Thayer Mahan's later writings. The wartime Navy accelerated industrial consolidation in shipbuilding centers, affected maritime law interpretations including prize court practice at United States District Court for the Southern District of New York-era venues, and left a legacy in joint operations doctrine adopted by successors in United States Navy history.

Category:United States Navy Category:American Civil War navies