He was commissioned as a captain in the 5th Missouri Volunteers.

He served in the Missouri Volunteers during the Seminole War.

The first four regiments were considered to be the regiments of Missouri Volunteers called for under President Lincoln's April 15, 1861 call for 75,000 volunteers.

Five regiments were designated the 1st-5th Missouri Volunteers and five additional regiments were created as the United States Reserve Corps.

During the Civil War, McClurg was a colonel in the Missouri Volunteers until elected to the U.S. House of Representatives in 1862, 1864 and 1866.

He entered the Union Army as captain in the Twenty-third Regiment, Missouri Volunteers, in 1861.

During the Mexican War, Slack raised a company of volunteers and served as their captain in the 2nd Missouri Volunteers under Sterling Price.

In the fall of 1861, Kelton was commissioned Colonel of the 9th Missouri Volunteers.

Civil War reenactors of the Turner Brigade of Missouri Volunteers.

However, it was subsequently organized and uniformed as a standard infantry regiment and mustered into Federal service on September 18, 1861 as the 9th Missouri Volunteers.