1st Missouri Infantry Regiment (Union)

On 10 May 1861, the 1st Missouri under Colonel Blair participated in the arrest of the Missouri Volunteer Militia drilling at Camp Jackson at Lindell Grove on the western border of St. Louis City. As the Missouri militiamen were being march under guard back to the Arsenal near the riverfront, angry crowds confronted the Federal forces and the confused situation soon devolved into rioting and gunfire. Over 27 people were killed and the Camp Jackson Affair helped to polarize the state and send Missouri down the road to its own internal civil war.

After the collapse of a truce negotiated by Federal Brigadier General William S. Harney and Missouri State Guard commander Sterling Price, the 1st Missouri, along with other Federal forces were ordered by Lyon to move on the Missouri state capitol, at Jefferson City. When the Federal forces arrived on 15 June, the pro-secessionist Governor, Claiborne Fox Jackson had already abandoned the city and Brigadier General Lyon's forces captured the city without resistance. Lyon then pursued Jackson and the State Guard to nearby Boonville where the 1st Missouri Volunteers helped defeat the newly organized Missouri State Guard on 17 June in the short, one-sided Battle of Boonville.[3] While the Battle of Boonville was small by later war standards, it had major strategic consequences, driving the pro-secessionist forces into the southern part of the state and securing the Missouri River valley and communications across the state for the Federal government.

The 1st Missouri continued to campaign with Lyon, marching southwest to Springfield, eventually confronting a united Confederate and Missouri State Guard force near Springfield. The resulting Battle of Wilson's Creek fought ten miles south of the city on 10 August 1861, was a bloody affair, and the second costliest in American history up to that time. The 1st Missouri, now under Lieutenant Colonel George Lippitt Andrews, fought with Lyon's detachment of the Federal force on Bloody Hill. Isolated and outnumbered after a second Federal element under Colonel Franz Sigel was routed, the Federals on Bloody hill fought the Confederate forces to a stalemate.[4] The battle ended only after General Lyon was killed leading the 1st Iowa Infantry against the Confederate right. As the senior U.S. Army regular officer present, command devolved to Major Samuel D. Sturgis. Concerned about his force's ammunition supply, Sturgis decided to withdraw towards Springfield.[5]

The 1st Missouri withdrew to Springfield and then to Rolla. A significant portion of the units members reenlisted as three-year volunteers, retaining the designation as the 1st Missouri Infantry. The regiment was then converted into an artillery unit by order of Major General John C. Frémont, Commander of the Department of the West on 1 September 1861. The resulting 1st Missouri Light Artillery would see action in most of the campaigns in the Western Theater.

• Francis Preston Blair, Jr., original commander of the regiment, later promoted to major general of volunteers.
• John Schofield, future Secretary of War and Commanding General of the United States Army

• "Official Army Register of the Volunteer Force of the United States Army, Part VII". Washington, D.C.: Secretary of War. 1867. Retrieved August 1, 2020.