Served in the Mexican - American war.............the US invaded Mexico and took DF.............from landing at Veracruz.........oddly enough, is where i went on my 1st honeymoon,,,,,,,,,,,in 1995..........my wife, Guadalupe...........Lupita, nickname..............keep telling me stuff............at one point i was like if u don't like Americans. don't marry one....................women.............it is all about them...........then she and her family became racist............the same happen with my current wife.................cowardish runs everywhere...................

Mexican–American War

Robert E. Lee around age 43 when he was a Brevet Lieutenant-Colonel of Engineers, c.1850

Lee distinguished himself in the Mexican–American War (1846–48). He was one of Winfield Scott's chief aides in the march from Veracruz to Mexico City. He was instrumental in several American victories through his personal reconnaissance as a staff officer; he found routes of attack that the Mexicans had not defended because they thought the terrain was impassable.

He was promoted to brevet major after the Battle of Cerro Gordo on April 18, 1847.^[43] He also fought at Contreras, Churubusco, and Chapultepec and was wounded at the last. By the end of the war, he had received additional brevet promotions to Lieutenant Colonel and Colonel, but his permanent rank was still Captain of Engineers and he would remain a Captain until his transfer to the cavalry in 1855.

For the first time, Robert E. Lee and Ulysses S. Grant met and worked with each other during the Mexican–American War. Both Lee and Grant participated in Scott's march from the coastal town of Vera Cruz to Mexico City. Grant gained wartime experience as a quartermaster, Lee as an engineer who positioned troops and artillery. Both did their share of actual fighting. At Vera Cruz, Lee earned a commendation for "greatly distinguished" service. Grant was among the leaders at the bloody assault at Molino del Rey, and both soldiers were among the forces that entered Mexico City. Close observations of their commanders constituted a learning process for both Lee and Grant.^[44] The Mexican–American War concluded on February 2, 1848.

After the Mexican War, Lee spent three years at Fort Carroll in Baltimore harbor. During this time, his service was interrupted by other duties, among them surveying and updating maps in Florida. Cuban revolutionary Narciso López intended to forcibly liberate Cuba from Spanish rule. In 1849, searching for a leader for his filibuster expedition, he approached Jefferson Davis, then a United States senator. Davis declined and suggested Lee, who also declined. Both decided it was inconsistent with their duties.^[45][46]

Early 1850s: West Point and Texas

The 1850s were a difficult time for Lee, with his long absences from home, the increasing disability of his wife, troubles in taking over the management of a large slave plantation, and his often morbid concern with his personal failures.^[47]

In 1852, Lee was appointed Superintendent of the Military Academy at West Point;^[48] he was reluctant to enter what he called a "snake pit", but the War Department insisted and he obeyed. His wife occasionally came to visit. During his three years at West Point, Brevet Colonel Robert E. Lee improved the buildings and courses and spent much time with the cadets. Lee's oldest son, George Washington Custis Lee, attended West Point during his tenure. Custis Lee graduated in 1854, first in his class.^[49]

Lee was enormously relieved to receive a long-awaited promotion as second-in-command of the Second Cavalry regiment in Texas in 1855. It meant leaving the Engineering Corps and its sequence of staff jobs for the combat command he truly wanted. He served under Colonel Albert Sidney Johnston at Camp Cooper, Texas; their mission was to protect settlers from attacks by the Apache and the Comanche.