What was the first military base in Colorado?

The first military base in Colorado was Fort Garland, established in 1858. It was originally built to protect settlers and maintain order in the San Luis Valley during the turbulent period of westward expansion. The fort played a significant role in the U.S. Army's efforts to manage conflicts with Native American tribes in the region. Today, Fort Garland is preserved as a historic site and museum, showcasing its importance in Colorado's early history.