(rāsä´kä ŧħā lä päl´mä)
, valley, an abandoned bed of the Rio Grande, N of Brownsville, Tex., where the second battle of the Mexican War was fought, May 9, 1846. Mexican troops under Gen. Mariano Arista, retreating south after the battle of Palo Alto, were defeated by American forces led by Gen. Zachary Taylor.
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