Military units and formations of Louisiana

Military units and formations of Louisiana
Unit name	Military units and formations of Louisiana
Country	United States
Allegiance	Varied (French, Spanish, Confederate, Union, United States)
Branch	Land forces, naval militias
Type	Regiments, battalions, militia, National Guard
Dates	1699–present

Military units and formations of Louisiana

Louisiana has produced a diverse array of military units and militia formations since the French colonization of the Americas and the founding of La Nouvelle-Orléans through the War of 1812, the American Civil War, the Spanish–American War, both World War I and World War II, and contemporary deployments in Iraq War and War in Afghanistan (2001–2021). Units raised in Louisiana have served under French Empire (Napoleonic) military, Spanish Army, the Confederate States Army, the Union Army, and the United States Army, and many lineages continue in the Louisiana National Guard and the United States Army Reserve.

Colonial and Revolutionary-era units

During the French colonial empire period, Louisiana raised colonial companies such as the Compagnie des Indes-affiliated militias in La Louisiane (New France), including detachments stationed at Fort Louis de la Mobile and Fort Iberville. Under Spanish Louisiana, units like the Milicia provincial served garrisons at New Orleans and Baton Rouge and under commanders tied to the Spanish Empire. In the era of the American Revolutionary War, local militia elements and Creole volunteers engaged against British America interests and interfaced with Continental Army agents, while privateers from Port of New Orleans and militia bands contested control during the War of 1812 engagements such as the Battle of New Orleans under leaders connected to the Militia Act of 1792 context.

Civil War units (Confederate and Union)

Louisiana furnished numerous Confederate formations including the famed 1st Louisiana Native Guard (Confederate), the 1st Louisiana Infantry (Confederate), the 2nd Louisiana Infantry Regiment (Confederate), and the Louisiana Tigers brigades formed in and around New Orleans and Vicksburg Campaign theaters. Coastal batteries defended Fort Jackson and Fort St. Philip during the Capture of New Orleans (1862). Concurrently, Union-loyal units such as the 1st Louisiana Native Guard (Union) and other United States Colored Troops (USCT) regiments recruited in Louisiana served with the Department of the Gulf and participated in operations like the Siege of Port Hudson and the Red River Campaign. Louisiana cavalry units, including elements involved in the Battle of Shiloh and the Western Theater (American Civil War), reflected divided loyalties across parishes like Orleans Parish and Jefferson Parish.

19th-century militia and volunteer formations

Postbellum Louisiana reorganized volunteer infantry and militia troops under state law, producing units such as the Pelican Regiment-style volunteer companies, parish-based militia like the Orleans Guards, and mounted units connected to the Militia Act of 1903 precursors. During the Spanish–American War, volunteer regiments from New Orleans and Shreveport mustered for the Puerto Rico campaign and coastal defense duties. The period saw integration of veterans from Mexican–American War-era service, civic organizations such as Veterans of Foreign Wars precursors, and National Guard antecedents that traced lineage to antebellum militia traditions and the Posse Comitatus Act environment.

20th-century units: World Wars and interwar period

In World War I, Louisiana provided National Guard units federalized into formations like the 156th Infantry Regiment (United States), which fought within the 39th Division (United States), and personnel contributed to the American Expeditionary Forces including service in the Meuse-Argonne Offensive. Between the wars, units reorganized under the National Defense Act of 1920 and National Guard (United States) frameworks; coast artillery and engineer companies served at installations such as Fort Jackson (South Carolina) and coastal batteries defending the Gulf of Mexico. In World War II, Louisiana units included the 141st Infantry Regiment (United States), elements of the 36th Infantry Division (United States) lineage, aviation detachments contributing to the Army Air Forces training centers in Barksdale Field, and port units supporting the Battle of the Atlantic logistics networks through New Orleans Port operations.

Louisiana National Guard and modern state forces

The modern Louisiana National Guard comprises the 256th Infantry Brigade Combat Team, the 225th Engineer Brigade, the 199th Brigade Support Battalion-aligned logistics, aviation units at Pineville (Camp Beauregard), and the 159th Fighter Wing (Air National Guard) at Naval Air Station Joint Reserve Base New Orleans antecedents. State defense forces and naval militia entities, including the Louisiana Naval Militia historical formations, have been organized for hurricane response in coordination with Federal Emergency Management Agency components and state emergency statutes. The Guard’s structure reflects lineage honoring preexisting Confederate States Army and Union Army units through official United States Army Center of Military History lineage determinations.

Federal activations, deployments, and unit lineage

Louisiana units have been federally activated for conflicts such as the Korean War, Vietnam War, the Global War on Terrorism, including deployments to Iraq, Afghanistan, and peacekeeping rotations under United Nations or NATO logistics umbrellas. Lineage and honors tie the 156th Infantry Regiment and the 199th Brigade to campaign streamers from the Meuse-Argonne Offensive to Operation Iraqi Freedom, with Federal recognition managed by the National Guard Bureau and honors recorded by the United States Army Center of Military History. State and federal dual-status activations have placed Louisiana units under Title 32 of the United States Code and Title 10 of the United States Code orders for domestic support and overseas contingency operations.

Notable commanders and unit honors

Prominent figures associated with Louisiana formations include commanders who served in Andrew Jackson’s Battle of New Orleans staff, Civil War leaders who held commands in the Trans-Mississippi Theater, World War generals connected to the American Expeditionary Forces, and postwar National Guard commanders recognized by awards such as the Silver Star and Legion of Merit. Units from Louisiana have received campaign streamers for engagements including New Orleans (1815), the Red River Campaign, Meuse-Argonne Offensive, Normandy support roles via logistic detachments, and modern theater decorations for service in Iraq War and War in Afghanistan (2001–2021). Lineage certificates and unit heraldry are maintained through official channels including the National Guard Bureau and the United States Army Center of Military History.

Category:Military in Louisiana Category:Louisiana National Guard Category:Military units and formations of the United States by state