Overview. The Battle of Sacramento - Currier and Ives. Between and , two neighbors, the United States and Mexico, went to war. It was a defining. The Battle of Buena Vista on February 23, , was perhaps the most dramatic fight of the U.S.-Mexican War. After the Battle of Monterey in September. Battles of the War Overview. The battle of Palo Alto. Hostilities between the United States and Mexico began on April 25, , and continued until September.