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Battle of Palo Alto

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Battle of Palo Alto

The Battle of Palo Alto (Spanish: Batalla de 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, as 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.

The Americans ended up ensconced at what came to be known as Fort Brown right across the Rio Grande from Matamoros. On April 24, Arista arrived at Matamoros, having sent General Anastasio Torrejon with a portion of the army across the river to a point a few miles up the river from Matamoros. His plan was to throw troops across the Rio Grande, above and below the positions occupied by the Americans, and advancing to Point Isabel: the base of Taylor’s supply line on the Atlantic Coast, cut off Taylor from his supply line forcing him into an engagement.

After having dispatched Torrejon, Arista marched with the remainder of the troops and twelve pieces of artillery to Longoreño about five leagues east down the river. Leaving Francisco Mejia with only a small garrison in command at Matamoros.

The crossing at Longoreño was long delayed due to a lack of boats thus reducing Arista’s element of surprise, but Taylor was already on to him. The fact that Torrejon had crossed the river and was already further up west was discovered when Captain Thornton and his dragoons who had been sent up the river, fell into an ambuscade and were captured, which came to be known as the Thornton Affair. Later Taylor received intelligence that Mexican forces were preparing to cross the river below his position and not believing that Arista would make a direct assault on his fortified camp, concluded that Point Isabel was the true target.

On May 1, Taylor left his camp well fortified and marched toward Point Isabel which he reached the following day. Meanwhile Arista was crossing the river with his army and received intelligence that Taylor was anticipating his moves. He then gave orders for the batteries at Matamoros to fire upon Fort Brown and sent Pedro de Ampudia with four guns to besiege it. The cannonade began at five in the morning on May 3. Meanwhile Arista united his forces with those of Torrejon and took up a position at Palo Alto east of Point Isabel and North of Fort Brown thus cutting off communications between Fort Brown and Point Isabel. Taylor and his troops however heard the shelling of Fort Brown and Captain Walker was sent with a small cavalry escort to make contact with Fort Brown. By making a very wide turn he evaded Arista and then hid his men in the chaparral making his way alone by night to Fort Brown only to discover that the American troops there were enduring the bombardment with little damage. By the morning of May 5, he was back at Point Isabel with this news.

Taylor now determined to go to the relief of the fort with supplies of ordnance and provisions and on the 7th now set off again for Matamoros with two thousand three hundred men. On May 8 at around noon Taylor’s forces crossed paths with Arista’s forces and both began to prepare for battle.

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