Organized as Company "B," 2nd Kansas Cavalry, December 9, 1861. Organized as a Battery October 27, 1862, with guns captured at Old Fort Wayne, and designated as Hopkins' Kansas Battery. Designated 3rd Battery October 1, 1863. Attached to 3rd Brigade, 1st Division, Army of the Frontier, Dept. Missouri, October, 1862, to February, 1863. District of Northwest Arkansas, Dept. Missouri, to June, 1863. District of the Frontier, Dept. Missouri, to December, 1863. 3rd Brigade, District Frontier, Dept. Missouri, to January, 1864. 3rd Brigade, District of the Frontier, 7th Corps, Dept. Arkansas, to January, 1865.
Occupation of Newtonia October 4, 1862. Hazel Bottom October 14. Shell's Mill October 16. Cane Hill November 28.
Battle of Prairie Grove, Ark., December 7. Expedition over Boston Mountains to Van Buren December 27-31. At Rhea's Mills January 1, 1863. Ordered to Fort Gibson February, arriving March 1, and duty there till July 17, 1863. Action at Webber's Falls April 28. Honey Springs July 1. At Webber's Falls and Scullyville till September. March to Van Buren September 2, and duty there till January 1865. (A detachment of 60 men sent to Little Rock to receive new Battery and duty there till January, 1865. Attached to Battery "G," 1st Missouri Light Artillery. September 13, 1864, to January 1, 1865.) Mustered out January 19, 1865. Veterans and Recruits transferred to 2nd Kansas Battery.
Battery lost during service 2 Enlisted men killed and 18 by disease. Total 20.