While separated, the 1st battalion served as a private bodyguard for general Egbert B.

Brown in Missouri, and were then assigned to Francis J. Herron and participated in the Battle of Prairie Grove, and were subsequently an escort for general William W. Orme.

About a fifth of the regiment mustered out of federal service at Memphis, Tennessee, on July 3, 1865, comprising men whose term was set to expire on or before October 1, 1865.

The remainder of the regiment was mustered out at Austin, Texas, on November 15, 1865, and disbanded at Madison, Wisconsin, on December 14, 1865.

[1] The regiment suffered 24 enlisted men killed or died from wounds in action, and 4 officers and 284 enlisted men who died of disease, for a total of 312 fatalities.