Fought the day after Palo Alto in dense chaparral that negated Mexican numerical advantages and neutralized artillery. American forces pushed aggressively through the brush, captured Mexican artillery, and broke the enemy line. Captain Charles May's dragoon charge captured Mexican General Vega. The routed Mexican army fled toward and across the Rio Grande, suffering heavy losses in the crossing.
The twin victories of Palo Alto and Resaca de la Palma secured the Rio Grande frontier, forced Mexico's Army of the North back across the river, and gave Taylor a strategic springboard for his subsequent invasion of northeastern Mexico. News of the victories electrified the American public and strengthened President Polk's war message to Congress.
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A second truce covered May 9–11, 2026, timed to Russia's Victory Day commemorations, and included a prisoner exchange — the one form of cooperation that has continued more or less uninterrupted since 2022. Like the Easter truce it was short, unmonitored, and expired into resumed fighting. The prisoner exchanges, by contrast, have run to tens of thousands of people and constitute the only functioning channel between the two governments.
Confirmed that both sides could stop shooting when it suited them and that neither would do so for longer than a holiday — while the prisoner-exchange channel remained the one piece of the relationship that worked.
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