Texas Campaign
Part of the Mexican–American War
The Battle of Palo Alto
Date 25 April – 9 May 1846 Location Texas, United States Result American Victory
Belligerents
United States	Mexico
Commanders and leaders
Zachary Taylor Seth Thornton (POW) Jacob Brown †	Mariano Arista Anastasio Torrejón
Strength
2,400 (May)	4,000 (May)
Casualties and losses
60 killed 149 wounded	335 killed 336 wounded

The Texas Campaign was the first front in the Mexican–American War, fought between the United States and Mexico. The front started with a Mexican assault near Brownsville. US forces were forced to surrender after hours of resisting, which led President James K. Polk to declare war on Mexico. After the United States defeated a larger Mexican Army at Palo Alto and Resaca de la Palma, Mexican Forces led by Mariano Arista retreated out of Texas.