7th Cavalry Regiment the Black Hills, starting a gold rush in 1874 that precipitated the Great Sioux War of 1876–77. In June, 1876, Lieutenant Colonel George A. Custer was killed in the Battle of the Little Bighorn, Montana, along with 267 soldiers of the 7th Cavalry. Although the regiment is well known for the Battle of the Little Bighorn, it also participated in other battles of the American Indian Wars, including the Battle of Bear Paw in Montana (30 September 1877 – 5 October 1877) and the Battle of Crow Agency in Montana (5 November 1887). On 29 December 1890, the regiment instigated
5th Cavalry Regiment Henry Thomas. The regiment was rebuilt with new officers and recruits loyal to the Union and was assigned to the Army of the Potomac under the command of General George McClellan. On 21 July 1861, the regiment participated in its first battle of the American Civil War, the First Battle of Bull Run; it was the last action in which they would be called the "2nd Cavalry." In the summer of 1861, all regular mounted regiments were re-designated as "cavalry", and being last in seniority among the existing regiments, the regiment was re-designated as the 5th United States Cavalry. During