List of United States military and volunteer units in the Mexican–American War

Regiments of dragoons • 1st Regiment of Dragoons, Colonel Richard B. Mason • 2nd Regiment of Dragoons, Colonel William S. Harney Regiments of artillery • 1st Regiment of Artillery, Lt. Colonel Benjamin K. Pierce • 2nd Regiment of Artillery, Colonel James Monroe Bankhead • 2nd Regiment of Infantry, Lt. Colonel Bennet Riley • 10th Regiment of Infantry, Colonel Robert E. Temple, (appointed from New York) • 11th Regiment of Infantry, Colonel Albert C. Ramsey, (appointed from Pennsylvania) • 12th Regiment of Infantry, Colonel Milledge L. Bonham, (appointed from South Carolina) • 13th Regiment of Infantry, Colonel Robert M. Echols, (appointed from Georgia) • 14th Regiment of Infantry, Colonel William Trousdale, (appointed from Tennessee) • 15th Regiment of Infantry, Colonel George W. Morgan, (appointed from Ohio) • 16th Regiment of Infantry, Colonel John W. Tibbatts, (appointed from Kentucky) • Regiment of Voltigeurs and Foot Riflemen, Colonel Timothy P. Andrews, (appointed from District of Columbia) ==Volunteer units serving in Mexico from 1846 to 1848==

Alabama • Battalion of Alabama Volunteers, for 3 months (4 companies); May–August 1846. Lt. Colonel Phillip H. Raiford • Battalion of Alabama Volunteers, for the duration of the war with Mexico (5 companies); November and December 1847 – June 1848. Major John I. Seibels • Independent Companies of Arkansas Mounted Volunteers in the Mexican War: • 1st Independent Company, Arkansas Mounted Volunteers; 27 May 1847 – 24 June 1848. Captain Gaston Meares (late Lt. Colonel Arkansas Volunteer Regiment) • Mounted Rifle Company A. Captain Richard Owens • 2nd Independent Company of Florida Volunteers, for the duration; August 1847 – July 1848. Captains: K. G. Livingston, (died 9 February 1848 at Guadaloupe, Mexico); George Holmes (2nd Lieutenant to March 1848) • Battalion of Georgia Volunteers, for the duration, (5 companies); July 1847 – July 1848. Lt. Colonel Isaac G. Seymour • 2nd Regiment of Illinois Volunteers, for 12 months; June 1846 – June 1847. Colonel William H. Bissell • 2nd Regiment of Indiana Volunteers, for 12 months; June 1846 – June 1847. Colonels: Joseph Lane (appointed Brigadier General U.S. Volunteers, 1 July 1846); William A. Bowles The Mormon Battalion was recruited as a federal volunteer unit, not through the state of Iowa which was not created until December 1846. The Mormon Battalion was raised at the express invitation of President James K. Polk, not as part of any state or territorial requisition for troops. The contemporary official Army documents refer to the unit in the following ways; Prior to Allen recruiting the unit as, "Capt. Allen's Battalion of Volunteers". As the new unit was being recruited and mustered into service, its first commander, James Allen, signed official documents with the name he gave the unit, "Mormon Battalion", General Stephen Watts Kearny, in letters of reply to the unit used Allen's naming convention, calling it the "Battalion of Mormons" and "Mormon Battalion" P. St. George Cooke, commanding the battalion under orders from Gen Kearny used the name, "Mormon Battalion" when reporting troop strengths in California. Kentucky • Regiment of Kentucky Cavalry Volunteers, for 12 months; June 1846 – July 1847. Colonel Humphrey Marshall (former 2nd Lt 1. U.S. Dragoons.) • 1st Regiment of Kentucky Volunteers, for 12 months, "Louisville Legion"; May 1846 – May 1847. Colonel Stephen Ormsby • 2nd Battalion of Louisiana Volunteer Artillery, for 6 months, (3 companies), received for 3 months, May–July 1846. Major Louis Gaily (commander 1st Battery) • Regiment of Maryland and District of Columbia Volunteers, for the duration, (8 companies); May and June 1847 – 24 July 1848. Colonel George W. Hughes (Captain and brevet Lt. Colonel Topographic Engineers) • 1st Regiment, Bodfish Company (Company D), Captain Charles N. Bodfish • 1st Regiment, Simmons Company, Charles Simmons • 1st Regiment, Cummings Company, Captain George W. Cummings • 1st Regiment, Wardell Company, Ira Wardwell • 1st Regiment, Pike Company, Captain Jabez T. Pike • 1st Regiment, Nutting Company, Jesse Nutting • 1st Regiment, Morrill Company, Captain John H. Morrill • 1st Regiment, McCluskey Company (Company B), Captain John McCluskey • 1st Regiment, Thomas and Tripp Company, General James Thomas and Samuel Tripp • 1st Regiment, Goodwin Company (Company C), Captain Moses Goodwin Jr. • 1st Regiment, Young Company, Moses H. Young • 1st Regiment, Smith Company (Company G), Wendell L. Smith Massachusetts • Regiment of Massachusetts Volunteers, for the duration of the Mexican War, January and February, 1847 – July 1848. Colonels: Caleb Cushing, (15 January 1847: promoted to Brig. General); Isaac H. Wright (Lt Colonel to 27 May 1847). Michigan • Regiment of Michigan Volunteers, for the duration; December 1847 – July 1848. Colonel Thomas B.W. Stockton (former 1st Lieutenant, 1st. U.S. Infantry) • Independent Company of Michigan Volunteers, for the duration, 18 June 1847 – 30 June 1848. Captain Morgan L. Gage • 2nd Regiment of Mississippi Volunteers, for the duration; received January 1847 – July 1848. Colonels: Reuben Davis (resigned October 1847); Charles Clark (Captain to 16 October 1847) • Battalion of Missouri Volunteers, for 12 months; (3 Light Artillery companies; 2 Infantry companies); June and July 1846 – June and July 1847. Major Meriwether L. Clark (former 2nd Lieutenant 6th U.S. Infantry and Aide de Camp to General Scott) New York • 1st Regiment of New York Volunteers, for service in California and the duration of the war with Mexico; (originally designated 7th Regiment of New York Volunteers) August–October 1848. Colonel Jonathan D. Stevenson • 2nd Regiment of New York Volunteers, for the duration; (originally designated 1st Regiment of New York Volunteers) November 1846 – August 1848. Colonel Ward B. Burnett (former 2nd Lt. 2nd U.S. Artillery, severely wounded at Churubusco) Ohio • 1st Regiment of Ohio Volunteers, for 12 months; June 1846 – June 1847. Colonel Alexander M. Mitchell (former 2nd Lieutenant, 4th U.S. Infantry, wounded at Monterey) • 2nd Regiment of Ohio Volunteers, for 12 months; June and July 1846 – June 1847. Colonel George W. Morgan • 2nd Regiment of Pennsylvania Volunteers, for the duration, (12 companies); January 1847 – July 1848. Colonels: William B. Roberts (died in City of Mexico 3 October 1847); John W. Geary (Lt. Colonel to 3 November 1847, wounded at Chapultepec.) Tennessee • Regiment of Tennessee Mounted Volunteers, for 12 months; June 1846 – May 1847. Colonel Jonas E. Thomas • 1st Regiment of Tennessee Volunteers, for 12 months, (12 companies); May and June 1846 – May 1847. Colonel William B. Campbell (former Capt. in Trousdale's Regt. in Florida War) • 1st Regiment of Texas Mounted Rifle Volunteers, June and July, and discharged September and October 1846. Colonel John C. Hays (late Major of a Batt. in the service of Texas.) • 2nd Regiment of Texas Mounted Volunteers, June and July, and discharged October 1846. Colonel George T. Wood • Regiment of Texas Rifle Volunteers, May, June and July, and discharged August 1846. Colonel Albert Sidney Johnston (former Adjutant U.S. 6th Infantry and Adjutant General of Texas.) • Battalion of Texas Mounted Volunteers, of (4 companies); March 1847 – June 1848. Majors : Michael H. Chevallie (late of Major Hays 1st Regt.; resigned 31 August 47); Walter P. Lane (Captain to October 1847) • Regiment of Texas Mounted Volunteers, for 12 months and during the war; April 1847 – May 1848. Colonel John C. Hays (Col. of 1st Regt. Vols, and continued in service) • Regiment of Texas Mounted Volunteers, for 6 months, for frontier defense; 11 May, and discharged June 1847. Colonel John C. Hays (Col. of Regt. in Mexico) • Battalion of Texas Mounted Volunteers,(part of Col. Hays regiment) (5 companies), for local defense; April – 5 June 1847. Major Thomas J. Smith • 4th Mounted Company; May and August 1846 – 18 September 1846. Captain Benjamin McCulloch • 5th Mounted Company; July–October 1846. Captain Eli Chandler • 11th Mounted Company of Spies; 31 January – 31 July 1847. Captain Ben McCulloch (Major in the Staff) Misc. volunteers • Battalion of "Santa Fe" Mounted Volunteers, for during the war with Mexico, (4 companies); July and August 1847 – 20 October 1848. Major Robert Walker (late Adjutant of Price's Regt. Missouri Volunteers) ==U.S. Navy squadrons serving in the war==

Home Squadron • The Home Squadron operated in the Gulf of Mexico and was led by Commodore David Conner. Conner was appointed to command the squadron on 30 December 1843. He was relieved by Commodore Matthew C. Perry on 3 March 1847. The Revenue Marine cutters listed in the U.S. Revenue Marine Service section of this list article were also assigned to the Home Squadron. • , Captain Samuel Livingston Breese; Commander John Kelly • , Commander George F. Pearson • , Captain William Jameson • USS Etna • , • , Commander Joseph R. Jarvis • , • , • , • Steamship Hunter • , • , • , • , • , • , • , • USS Petrel, (ex-Champion), Lieutenant Samuel Lockwood • , • , Commander Abraham Bigelow • , • , • (ex-St. Marys), Commander George H. Magruder • , • , • , • , • , • , • , • USS Libertad, • USS Malek Adhel, • , • , • , • , • Battalion of Sailors, from the fleet on the Pacific coast, organized by Commodore Robert F. Stockton, for the recapture of Los Angeles, California, January 1847. Major Stephen C. Rowan (Lieutenant U.S. Navy) • Artillery Company. Captain Richard L. Tilghman (Lieutenant) • A Company. Captain John Guest (Acting master) • B Company. Captain William B. Renshaw (Lieutenant) • C Company. Captain Benjamin F. B. Hunter (Acting Lieutenant) • D Company. Captain Edward Higgins (Acting Lieutenant) • E Company. Captain J. Fenwick Stenson (Acting Lieutenant) • F Company. Captain James M. Duncan (Passed Midshipman) • G Company. Captain John Peed (Sailmaker) • Sappers and Miners. Captain John Southwick (Carpenter) ==U.S. Marine Corps==

• Many of the U.S. Navy Home and Pacific Squadron ships had detachments of U.S. Marine Corps personnel aboard used as ship's guards and as landing party. They were under the direction of the captain of the ship they were assigned. Marine detachments from Home Squadron ships were used as landing party in the capture of Veracruz. Marines under the command of Captain Alvin Edson, USMC, were used to capture and hold Tabasco. The town was garrisoned by a detachment of Marines commanded by Lieutenant William B. Slack, USMC. During the capture of Monterey, 85 Marines and more than 140 sailors from Cyane, Levant, and Savannah were landed and commanded by Captain William Mervine, USN. Seventeen Marines and 57 sailors from Dale were landed and captured La Paz in October 1847. Dale also captured Guayamas in November using 17 Marines and 50 sailors under the command of Lieutenant Thomas O. Selfridge, USN. Marines from Independence, Cyane, and Congress were tasked with garrisoning San Jose in November 1847 • Battalion of Marines; March 1847. Attached to the 3rd Artillery Regiment for garrison duty near Veracruz. • Battalion of Marines; May 1847 – January 1848. Brevet Lieutenant Colonel Samuel E. Watson. Attached to Brigadier General John A. Quitman's 4th Division consisting of volunteers from New York, Pennsylvania, and South Carolina. Served at the Battle of Chapultepec 13 September 1847. ==U.S. Revenue Marine==

• The following Revenue Marine cutters were dispatched to serve under the command of the "Commanding General of the Army of Occupation" on 19 May 1846 under orders from the Secretary of the Treasury Robert J. Walker. The squadron was tasked with convoy, towing, and blockade duties as well as transporting troops, supplies, mail, and dispatches for the U.S. Army and was also ordered to cooperate with the U.S. Navy. The squadron was under the overall command of Captain John A. Webster, Sr., who chose Ewing as his flagship. Webster served as squadron commander until 10 December 1846 when he was taken ill by a fever. He was relieved by Captain Winslow Foster who served as squadron commander thereafter. • McLane. Captain William A. Howard, 16 May 1846 – 4 June 1847 • Spencer. Captain Caleb Currier, 16 May 1846 – 14 July 1846 • Legare. Captain N.L. Coste, 16 May 1846 – 26 October 1846 • Woodbury. Captain William B. Whitehead, 16 May 1846 – 9 July 1846 • Ewing. Captain Gay Moore, 16 May 1846 – 15 April 1847 • Forward. Captain Henry B. Nones, 16 May 1846 – 30 April 1847 • Van Buren. Captain Thomas C. Rudolph, 16 May 1846 – 31 October 1846 • Four additional cutters were dispatched under either separate orders or at a later date. • Bibb. Captain Winslow Foster, 7 January 1847 – 31 May 1847 • Morris. Captain Green Walden, 16 May 1846 – 2 November 1846 • Wolcott. Captain Louis C. Fatio (to 1 September 1846), Captain Levy C. Harby (from 1 September 1846), 16 May 1846 – 11 May 1847. Used for carrying dispatches from Mexico to New Orleans, Louisiana. • Polk. Placed under the command of Lieutenant W.S. Ogdon, U.S. Navy, 14 March 1846 – 3 May 1846 ==Notes==