|Battle of Palo Alto|
|Part of the Mexican–American War|
Painting by Carl Nebel [a] 
|Commanders and leaders|
|Zachary Taylor||Mariano Arista|
8 artillery pieces
12 artillery pieces
|Casualties and losses|
The Battle of Palo Alto was the first major battle of the Mexican–American War and was fought on May 8, 1846, on disputed ground five miles (8 km) from the modern-day city of Brownsville, Texas. A force of some 3,700 Mexican troops – most of the Army of The North – led by General Mariano Arista engaged a force of approximately 2,300 United States troops – the Army of Occupation led by General Zachary Taylor.  
On April 30, following the Thornton Affair, Mexican General Mariano Arista's troops began to cross the Rio Grande. On May 3, the troops began to besiege the American outpost at Fort Texas. Taylor marched his Army of Occupation south to relieve the siege. Arista, upon learning of his approach, diverted many of his units away from the siege to meet Taylor's force. The battle took place on May 8, three days before the formal declaration of war on Mexico by the United States. Arista ordered two cavalry charges, first against the American right flank and later against the left. Both were unsuccessful. The American victory is widely attributed to superior artillery, while the U.S. "light" artillery was much more mobile and accurate than that of the Mexican forces.
That evening, Arista was forced to withdraw further south. The armies clashed again the next day at the Battle of Resaca de la Palma.
On April 30, following the Thornton Affair, Arista started crossing the Rio Grande at Longoreno with his main army, first with General Pedro de Ampudia's 1st Brigade and four guns. Taylor prepared Fort Texas to withstand a siege while he moved most of his forces to protect his supply base at Fort Polk near Point Isabel, 23 miles northeast of present day Brownsville, Texas, and having a Gulf of Mexico pass suitable for ships. Fort Texas was garrisoned by Taylor with 500 men under Major Jacob Brown, including the 7th Infantry, Capt. Allen Lowd's four 18-pounders, and Lt. Braxton Bragg's field battery. 
The battle began as a result of Mexican efforts to besiege Fort Texas on May 3, General Zachary Taylor, in command of the Army of Occupation, receiving supplies from Fort Polk on Point Isabel, heard the distant report of cannon fire.  Taylor started his return to Fort Texas on May 7 with 2,228 men plus his 200-wagon supply train. General Arista immediately left his camp at the Tanques del Ramireno with his army, with the intention of blocking Taylor. Ampudia's brigade left the Fort Texas siege to join him. Taylor's scouts sighted the Mexican force at noon on the 8th. 
Facing north and moving left to right, General Arista's army consisted of General Antonio Canales Rosillo's 400 irregular cavalry in chaparral, Anastasio Torrejon's cavalry brigade consisting of the 8th, 7th and Light Cavalry, astride the Point Isabel road, then came General Jose Maria Garcia's brigade of the 4th and 10th Infantry with two 8-pounders, then General Rómulo Díaz de la Vega's brigade of the 10th and 6th Infantry with five 4-pounders, then the Tampico Corps, the 2d Light Infantry and a sapper battalion with a 4-pounder. Behind this line was Col. Cayetano Montero's light cavalry. 
Facing south and moving right to left, Taylor, with a force of 2,300 men and 400 wagons,  placed Col. David E. Twiggs with Lt. Col. James S. McIntosh's 5th Infantry and Maj. Samuel Ringgold's artillery battery, followed by Capt. Lewis N. Morris' 3d Infantry with Lt. William H. Churchill's two 18-pounders astride the road, followed by Capt. George W. Allen's 4th Infantry, Lt. Thomas Childs' artillery battalion, Lt. Col. William G. Belknap's wing, James Duncan's battery, then Capt. William R. Montgomery's 8th Infantry on the American left. Lt. Col. Charles A. May's dragoon squadron guarded the left flank and Capt. Croghan Ker guarded the train.  Montgomery was slightly wounded during the battle, along with approximately ten other officers, some of them severely. 
Taylor halted his columns and formed a line behind his batteries when the Mexican artillery started firing at 2 PM. The American artillery was very effective  while the Mexican artillery often fell short. Arista ordered Torrejon's cavalry to attack the American right, but progress was slow, allowing Twiggs to form the 5th Infantry into a square to meet them with a couple of volleys. 
A fire started from a cannon burning wad which halted fighting for an hour as the smoke paralleled between the lines of the opposing forces.  Arista pulled back 1,000 yards on his left and Taylor advanced accordingly, rotating the axis of the battle 40 degrees counterclockwise. May failed to turn the Mexican left before the artillery duel resumed. Child's artillery battalion formed a square to repel another Torrejon cavalry charge. Duncan's battery stopped Arista from turning the American left and then advanced with the 8th Infantry and Ker's dragoons to drive the Mexican right from the field. A charge ordered by Arista at this time resulted in the light cavalry fleeing along the Mexican line, taking the 6th Infantry with them. Fighting stopped with dusk and both armies camped for the night. 
The morning of the 9th revealed the Mexican army slowly moving south. Taylor sent forward a 220-man battalion under McCall to reconnoiter the Mexican positions.  The Battle of Resaca de la Palma would follow.
Major Ringgold was struck by a cannon ball and mortally wounded during the battle  but Ringgold's and Duncan's effective cannoneers with their "Flying Artillery"—the tactic of using light artillery to attack then quickly move to another location and fire once more, carried the day and won the battle for the Americans.  General Zachary Taylor emerged from the war a national hero. 
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Army of the North – Gen.div. Mariano Arista
- Deputy – Gen.br. Pedro Ampudia
- 1st Brigade – Gen. Jose M. Garcia
- 10th Line – Col. Jose M. Garcia, Bn.Comdte. Manuel Montero
- Artillery battery (2x 8-lb)
- 2nd Brigade - Gen.
Rómulo Díaz de la Vega
- 1st Line – Col. Nicolas Mendoza
- 6th Line – Lt. Col. F. Garcia Casanova
- Artillery battery (6x 4-lb)
- Brigade – Gen. Pedro Ampudia
- 4th Line – Col. Jose Lopez Uraga
- Villas of the North Cavalry Auxiliary
- Sappers Company
- Artillery battery (2x 6-lb ?)
- 2nd Light – Col. Jose Maria Carrasco, Lt.Col. M. Fernandez
- Tampico Coast Guards Battalion – Lt. Col. Ramon Tabera
- Zapadores (Sappers) Battalion – Lt. Col. Mariano Reyes
- Cavalry Brigade – Acting Gen.
- 7th & 8th Line – Col. A. Torrejon?
- Light Regiment of Mexico – Col. C. Montero
- Presidential Companies – Col. Sabariego
- Artillery battery (2x 4-lb guns)
- Irregular Cavalry (Rancheros) – Gen.br. A. Canales
Artillery – Gen. Tomas Requena
- Chief of div. Raphael Linarte
- Artillery battery (2x 8-lb, 2x 6-lb)
- Artillery battery (4x 4-lb) – Capt. Ballarta?
- Artillery battery (4x 4-lb)
Army of Observation – Brig. Gen. Zachary Taylor
1st Brigade "Left Wing" – Lt. Col. William G. Belknap
- Artillery Battalion (acting as Infantry) – Lt. Col. Thomas Childs
- Artillery battery – Capt. James Duncan
- 8th Infantry – Capt. William R. Montgomery
- Wagon Train – Capts. George H. Crosman & Abraham C. Myers
2nd Brigade "Right Wing" – Colonel David E. Twiggs
- 5th Infantry – Lt. Col. James S. McIntosh
- Light Artillery – Samuel Ringgold (mw)
- 3rd Infantry – Capt. Lewis M. Morris
- Artillery battery (2x 18-lb) – Lt. William H. Churchill
- 4th Infantry – Maj. George W. Allen
- Dragoons – Capts. Croghan Ker & Charles A. May
Zachary Taylor established Fort Polk [b], near Point Isabel, 23 miles northeast of present day Brownsville, with a Gulf of Mexico pass suitable for ships' landings, on March 24, 1846 as a supply base for his operations leading up to the Battle of Palo Alto, and used it until 1850. He garrisoned it with two artillery companies under Major John Munroe.  Major Charles Thomas was the Depot Quartermaster using wagons and river steamers to supply Taylor. 
Taylor established camps for those heeding his call for volunteers at Point Isabel, the north end of Brazos Island, and along the Rio Grande between Barita and Fort Brown, at a place known as Camp Belknap.
Rancho de Carricitos, the site of the Thornton Affair
- Battles of the Mexican–American War
- List of conflicts in the United States
- Hispanic Heritage Sites (U.S. National Park Service)
- Saint Patrick's Battalion
- Painting is in error by depicting background mountains. The nearest in any direction are 240 miles away, near Monterrey, NL, MX.
- Not to be confused with Fort Polk in Louisiana
- Stevens, 1864 https://www.loc.gov/item/02004806/, p. 20
- Bauer, 1974, pp. 19, 57
- Frost, 1848, pp. 9-10
- Bauer, 1974, p.49
- Bauer, 1974, pp. 52–53
- Bauer, 1974, p.53
- U.S. National Park Service, Essay
- Bauer, 1974, p.54
- Montgomery, 1847, p. 156
- Montgomery, 1847, p. 136
- Bauer, 1974, p.55
- Bauer, 1974, p.59
- Bauer, 1974, p.57
- A&E Television Networks, History.com, Essay
- Bauer, 1974, p.39
- Bauer, 1974, p.84
- Bauer, Karl Jack (1974). The Mexican War, 1846-1848. New York, Macmillan. ISBN 978-0-8032-6107-5.
- Frost, John (1848). The Mexican War and Its Warriors. H. Mansfield. ( eBook)
- Tucker, Spencer C., ed. (2013). The Encyclopedia of the Mexican-American War: A Political, Social, and Military History. 1. Santa Barbara, California: ABC-CLIO. ISBN 978-1-85109-853-8.
- Montgomery, Henry (1847). The life of Major General Zachary Taylor. Aubura, J. C. kDerby & co.
- "Palo Alto Battlefield". National Park Service. 2017. Retrieved June 25, 2017.
- "Battle of Palo Alto". A&E Television Networks: History.com. 2017. Retrieved June 25, 2017.
- Additional Reading
- Chartrand, René. "Santa Anna's Mexican Army, 1821–1848"
- Crawford, Mark. "Encyclopedia of the Mexican-American War"
- Haecker, Charles M. (1997). On the Prairie of Palo Alto. Texas A&M University Press. ISBN 9780890967584.
- Brooks, Nathan C. A Complete History of The Mexican War. Applewood Books (664 pages). ISBN 9781429021005.
- Robarts, William Hugh (1887). Mexican War Veterans: A Complete Roster of the Regular and Volunteer Troops in the War Between the United States and Mexico, from 1846 to 1848. Brentano's.
- Palo Alto Battlefield National Historic Site
- "Taking a Stand at Palo Alto," a Documentary on the Battle of Palo Alto
- Guns Along the Rio Grande: Palo Alto and Resaca de la Palma, CMH Pub 73-2, Center of Military History
- A Continent Divided: The U.S. - Mexico War, Center for Greater Southwestern Studies, the University of Texas at Arlington