U.S. president
James K. Polk had decided that an invasion into central Mexico via the Gulf Coast port of Veracruz would make the Mexicans come to the negotiating table. He told
Major General Zachary Taylor to stay in his position at Monterrey. Polk had placed General
Winfield Scott as commander of all the U.S. forces in Mexico. Scott himself ordered Taylor to remain in place. After the
Battle of Monterrey and the end of the armistice, Taylor's
Army of Occupation with Brigadier General
William J. Worth's 1,000 men advanced onto undefended
Saltillo on November 16, despite orders to halt any movement further south, considering it strategic to cover the approaches to
Monterrey and
Parras de la Fuente. Taylor then directed General
John E. Wool from
Monclova to Parras, the objective being control of that agricultural area. This was a significant force, but some troops had no uniforms or weapons. In general, Mexican forces had large numbers but had far fewer resources than those of the U.S., with outdated weapons, inability to pay its troops, and inability to consistently provision its forces, since there was no money to pay local civilians. Most troops were new recruits, and most had not fired a single weapon in training. However, Santa Anna had the advantage of knowing the territory since the Mexican army had often used the main route. In early January while encamped in
San Luis de Potosí, Santa Anna acquired a letter from General Scott ordering Worth's troops to join General
David E. Twiggs and General
John A. Quitman's divisions in
Veracruz, prompting Santa Anna to make attack plans for Saltillo. The winter weather was against the poorly dressed and provisioned Mexicans, with the coldest temperatures in decades. The men and women in Santa Anna's forces began to die of exposure, and thirst once the cold weather lifted was also a problem. Some
soldaderas set fire to trees around the encamped troops to warm them, but by the time the two armies fought, the Mexican forces had already lost thousands to illness, exposure, and desertion. Taylor moved 4,650 of his men to Agua Nueva on February 14, but on February 20, Major
Benjamin McCulloch's
Texas Rangers encountered Santa Anna's force at Encarnación, prompting Taylor's withdrawal to La Angostura ("the narrow place"), a mile and a quarter south of
Hacienda San Juan de la Buena Vista. General Wool was charged with selecting "the field of battle" and making "such dispositions of the troops on the arrival of the enemy" as he deemed necessary. Wool thought the site excellent for defense, since the road passed through a narrow valley here, which was crossed at right angles by several ravines east of the road and
arroyos were to the west. Wool placed Captain
John M. Washington's battery across the road, supported by the 1st Illinois under Colonel
John J. Hardin and 2nd Kentucky under Colonel William R. McKee. Continuing to the left was the 2nd Illinois under Colonel
William H. Bissell, General
Joseph Lane's Indiana Brigade, and the Kentucky and Arkansas horsemen, with two squadrons of
dragoons and a company of Texans in reserve. Santa Anna's forces consisted of Major General
Manuel María Lombardini's division and Major General Francisco Pacheco's division in the center with 14 pieces of artillery, Colonel Santiago Blanco's regiment of engineers, and three 16-pounders on the left, and Major General
Pedro de Ampudia's light infantry with General Julián Juvera's strong cavalry brigade on the right with two batteries. In reserve was Major General José María Ortega's infantry division and Brigadier General
Francisco Mejia's brigade. ==Battle==