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1847 Mexican War Buena Vista Doc signed by (General) Irvin McDowell
1847 Mexican War document signed by eventual General Irvin McDowell as A.A.G.

One page "Order" written from "Hd Qrs Buena Vista" on "April 11, 1847" detailing which regiments will perform guard duty & details the following day. Wear as shown.

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Irvin McDowell graduated from the United States Military Academy in 1838, and taught tactics at the academy from 1841 to 1845 to many of the generals he would eventually face on the battlefield. He served as an aide-de-camp to General J. E. Wool during the Mexican-American War, and received a brevet promotion to Captain for his service at the Battle of Buena Vista.

McDowell was born in Columbus, Ohio, son of Abram Irvin McDowell and Eliza Seldon McDowell. He was a cousin-in-law of John Buford, and his brother, John Adair McDowell, served as the first colonel of the 6th Iowa Volunteer Infantry Regiment during the Civil War. Irvin initially attended the College de Troyes in France before graduating from the United States Military Academy in 1838, where one of his classmates was P. G. T. Beauregard, his future adversary at First Bull Run. He was commissioned a second lieutenant and posted to the 1st U.S. Artillery. McDowell served as a tactics instructor at West Point, before becoming aide-de-camp to General John E. Wool during the Mexican–American War. He was brevetted captain at Buena Vista and served in the Adjutant General's department after the war. While in that department he was promoted to major on May 31, 1856

At the outbreak of the Civil War, on May 14, 1861, Irvin McDowell was promoted to the rank of Brigadier General as a result of political connections to the Secretary of the Treasury, Salmon P. Chase. Although he had never before commanded troops in combat, McDowell, facing political pressure, attacked Confederate forces at the First Battle of Manassas where he was consequently defeated. After the defeat, General George B. McClellan was made commander of the newly formed Army of the Potomac, and McDowell was detached from the army to protect Washington, DC. McDowell would later command a corps at the Second Battle of Manassas, which resulted in another defeat. On July 1, 1864, McDowell was put in command of the Department of the Pacific, and was relatively inactive for the remainder of the war.