Opened in February 2024, this museum is one of the newest in the city of Monterrey. It showcases the battle that was fought here on late September 1846 as part of a war between Mexico and the United States. The war started earlier that year and would continue with the fall of Mexico City in 1847 and officially end in early 1848. This makes the Battle of Monterrey a decisive one given that the city was among the most important found just south of the Rio Grande.

General Zachary Taylor led the U.S. forces during this battle, while Pedro de Ampudia was the general appointed by President Antonio López de Santa Anna on the Mexican side. The Battle of Monterrey would end with a U.S. victory, much like the war itself. After their defeat, Mexico lost about a third of its territory, including what is now  California and New Mexico. 

Another interesting display in the collection is dedicated to the Batallón de San Patricio (St. Patrick's Batallion), a brigade of immigrants, most of them Irish, who fought on the Mexican side during the war. Many of them saw the conflict between the mostly-Protestant United States and a mostly-Catholic Mexico as a reflection of the troubles in their homeland. Several of these immigrants had actually defected from the U.S. forces after being subject to anti-Catholic discrimination and abuse, and this included not only Irish fighters but also Polish, French, and even Black soldiers who preferred Mexico's anti-slavery policies. Many of these Patricios, as they also came to known, would be executed by U.S. forces after their Mexico City victory, one of the lesser-known aspects of the war.