1st Regiment Illinois Volunteer Cavalry

The 1st Regiment Illinois Volunteer Cavalry was a cavalry regiment that served in the Union Army during the American Civil War and Spanish-American War.

Service
Companies "A" to "G" of the 1st Illinois Cavalry were mustered into service at Alton, Illinois, on July 3, 1861. Among their initial officers was future Washington philanthropist David P. Jenkins, who served as the regiment's first major. Companies "I," "H" and "K" were mustered at Alton at later dates and never served with the main body of the regiment. The original companies served as guards for supply trains and depots until mustered out on July 14, 1862. The remaining companies served independently.

The last company was mustered out on December 27, 1862.

Total strength and casualties
The regiment suffered 17 enlisted men who were killed in action or who died of their wounds and 26 enlisted men who died of disease, for a total of 43 fatalities.

Commanders

 * Colonel Thomas A. Marshall - mustered out July 14, 1862, with the main body of the regiment.

Spanish-American War
Constituted 1 July 1897 in the Illinois National Guard as a squadron of cavalry and organized from existing troops. Expanded and mustered into Federal service 21 May 1898 at Springfield as the 1st Illinois Volunteer Cavalry; mustered out of Federal service 11 October 1898 at Fort Sheridan, Illinois. Reorganized in 1899 in the Illinois National Guard as a squadron of cavalry; expanded, reorganized and re-designated 22 June 1899 as the 1st Cavalry.

Subsequent redesignations and lineage
Mustered into Federal service 27 June 1916; mustered out of Federal service 17 November 1916 at Fort Sheridan, Illinois. Non-Chicago elements of the regiment converted and redisignated 24 June 1917 as the 3d Field Artillery (Chicago elements convereted and redesignated 9 June 1917 as the 2d Field Artillery - hereafter separate lineage). Drafted into Federal service 5 August 1917. Reorganized and redeisgnated 21 September 1917 as the 124th Field Artillery and assigned to the 33d Division. Demonilized 8 June 1919 at Camp Grant, Illinois. Reorganized 20 October 1922 in the Illinois National Guard as the 2nd Squadron, 106th Cavalry, an element of the 22d Cavalry Division (remainder of regiment alloted to the Michigan National Guard). Reorganized 1 September 1940 wholly in the Illinois National Guard as the 106th Cavalry and relieved from assignment to the 22d Cavalry Division (2d Squadron concurrently redesignated as the 1st Squadron of the 23d Cavalry Reconnaissance Squadron [constituted 1 January 1940 and organized in part by transfer of personnel from Troop F and Machine Gun Troop, 106th Cavalry] redesignated as the 2d Squadron. Inducted into Federal service 25 November 1940 at home stations. Regiment broken up 15 March 1944 and its elements reorganized and redesignated.