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.

Texas Campaign
Part of the Mexican–American War

The Battle of Palo Alto
Date25 April – 9 May 1846
Location
Result American Victory
Belligerents
 United States Mexico Mexico
Commanders and leaders
United States Zachary Taylor
United States Seth B. Thornton (POW)
United States Jacob Brown 
Mexico Mariano Arista
Mexico Anastasio Torrejón
Strength
2,400 (May) 4,000 (May)
Casualties and losses
60 killed
149 wounded
335 killed
336 wounded
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