The Battle of Churubusco took place on August 20, 1847, in the immediate aftermath of the Battle of Contreras during the Mexican-American War. The Mexicans made their stand at the Franciscan convent of Santa Mar穩a de Churubusco. The first assault, by the 5,000 U.S. divisions of William Worth and David Twiggs, was successfully repulsed. The brigade of Franklin Pierce crossed the river under fire, followed by Shields' brigade, and turned the Mexican right flank. On the left, elements of Worth's division also succeeded in a river crossing and took the Mexican defenses in the rear. Resistance collapsed except for those inside the convent, who held out for some time before surrendering. The Mexican-American War was an armed conflict between the United States of America and Mexico from 1846 to 1848 in the wake of the 1845 US annexation of Texas.