His actions were responsible for providing food and horses for the Grenadiers advancing to San Lorenzo, and as a forward observer in combat he earned a "battlefield promotion" to Lieutenant of the 1st Squadron on February 26, 1813[citation needed].

He remained in the convent of San Carlos with a squad of 40 men, with which he defeated a larger landing force in the Battle of Rincón de Zárate in August 1813.

[citation needed] In 1816 he was transferred to Mendoza where he joined the Army of the Andes, crossing to Chile under General José de San Martín in the column of Mariano Necochea, whose escort was a part.

He left for Buenos Aires to bring trophies from Chacabuco, and on March 10, the Supreme Director Pueyrredón promoted him to Sergeant Major.

[citation needed] Shortly after the Battle of Cepeda he left to serve in Buenos Aires, and was ordered by Governor Manuel Dorrego to lead the campaign against the province of Santa Fe, where he claimed victories at San Nicolas de los Arroyos and Arroyo Pavón, where he defeated Gamonal.

On the May 1, 1827, he received shipments of cash, and on September 7 was appointed Commander in Chief of the Northern Department of the province of Buenos Aires.

[citation needed] In 1828, Colonel Frederick Rauch was replaced as head of the northern border with the Indians, based in Salto, by order of Governor Dorrego, which earned the hatred of Prussia.

[citation needed] Pacheco later headed the campaign of 1831 against the League of Interior led by General Jose Maria Paz and Stephen Pederson.

[citation needed] In August 1840 General Lavalle invaded the province of Buenos Aires, landing in San Pedro.

Pacheco took command of an army that included José Félix Mendoza Aldana and Nazario Benavides, with whom Lamadrid tore apart in the bloody Battle of Rodeo del Medio.

[citation needed] In the Battle of Arroyo Grande on the December 6, 1842, Pacheco ordered the army infantry affiliates of the Confederation and the "White" Uruguayan forces (whose Commander in Chief was the deposed former President Manuel Oribe) under his command east, against the forces of the "Red" Uruguayan and Argentine unit led by Fructuoso Rivera.

[citation needed] In 1845 he was appointed head of the Frontier Centre Buenos Aires province, fought off raid attempts by ranqueles Indians, and ordered to form a strong Mulitas in Bragado.

[citation needed] In 1851, Justo José de Urquiza took the lead in opposition to Rosas which later culminated in the forming of the Grand Army from a coalition of Argentine Rebel, Uruguayan Liberation, and Brazilian Allied forces which started a two front war against both the Uruguayan and Argentine governments.

[citation needed] For the first time, Pacheco and Rosas disagreed on strategy in regards to what steps they should take next to deal with the threat of the Grand Army, and the Governor became wary of his General.

This year of birth would be more consistent with his record of military service, and that would be correct sitting position as a cadet at age 17 Patricios.