...ral Scott in the valley of Mexico, except a part of the division of General Quitman at San Augustin Tlalpam and the brigade of Garland (Worth's division) at San Antonio, were engaged at the battle of Contreras , or were on their way, in obedience to the orders of their chief, to reinforce those who were engaged. The assault was made on the morning of the 20th, and in less than half an hour from the sound ...