March 29 – Mexican–American War: United States forces led by General Winfield Scott take Veracruz after a siege.
April 18-Battle of Cerro Gordo August 12 – Mexican–American War: U.S. troops of General Winfield Scott begin to advance along the aqueduct around Lake Chalco and Lake Xochimilco in Mexico
August 20 – Mexican–American War: US troops defeat Mexican troops in Valencia de Fuentes, Mexico