The Dee Brown book does provide some interesting information on the activities of these troops out West.
George Martin
First U. S. Volunteer Infantry
1st REGIMENT INFANTRY.
Organized at Point Lookout, Md., January 21 to April 22, 1864. Moved to Norfolk, Va.,
and provost duty there and at Portsmouth, Va., District of Eastern Virginia, Dept.
of Virginia and North Carolina, to August, 1864. Ordered to Milwaukee, Wis., thence
to St. Louis, Mo., arriving there August 22. (4 Cos. remained in Wisconsin till
September, then ordered to Minnesota.) Six Companies moved from St. Louis to Fort Rice,
Dakota Territory, arriving there October 17, and garrison duty there; at Fort Berthold
and at Fort Union, mouth of the Yellowstone, till October, 1865. Moved to St. Louis, Mo.,
and mustered out November 27, 1865. Four Companies on duty in District of Minnesota
till May, 1866. Mustered out May 21, 1866.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3
...............
Second U. S. Volunteers
2nd REGIMENT INFANTRY.
Organized at Rock Island, Ill., October, 1864. Ordered to Dept. of Missouri and assigned
to duty in District of Upper Arkansas along the Santa Fe Road from Little Arkansas
River to Fort Dodge and Cimaron Crossing. Stationed by Companies at Fort Riley, Salem,
Fort Ellsworth, Fort Learned, Fort Zarah and Fort Scott, Kansas, on guard duty and
operating against Indians till November, 1865. Mustered out November 7, 1865.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3
................
Third U. S. Volunteers
3rd REGIMENT INFANTRY.
Organized at Rock Island, Ill., October, 1864. Ordered to Dept. of Missouri, arriving
at Fort Kearney, Neb., April 9, 1865, and assigned to duty in the District of Nebraska
and Colorado. Stationed by Companies. "A" and "B" at Fort Kearney, "E" and "F" at Fort
Rankin, "G" and "H" at Julesburg Junction, Colo., and "C" and "D" at Cottonwood protecting
overland mail routes from Indian attacks. Skirmish at Elm Creek May 20, 1865. Mustered
out November 29, 1865.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3
...................
4th REGIMENT US Volunteers INFANTRY.
Organized at Point Lookout, Md., October 31, 1864. Duty at Portsmouth, Va., District of
Eastern Virginia, Dept. of Virginia and North Carolina, and in District of the Northwest,
Dept. of Missouri, till July, 1866. Mustered out July 2, 1866.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3
.................
Fifth U. S. Volunteer Infantry
5th REGIMENT INFANTRY.
Organized at Alton and Camp Douglas, Ill., March to May, 1865. Ordered to Fort Leavenworth,
Kansas, May 3, 1865. Assigned to duty in District of Upper Arkansas from Little Arkansas
River to Fort Dodge and Cimaron Crossing. Duty in Districts of Nebraska, Colorado and
Utah and the Plains till November, 1866. Mustered out November 13, 1866.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3
...................
Sixth U. S. Volunteer Infantry
6th REGIMENT INFANTRY.
Organized at Columbus, Ohio, Camp Morton, Ind., and Camp Douglas, Ill., April 2, 1865.
Ordered to Fort Leavenworth, Kansas, May, 1865, arriving there May 11. Moved to Fort
Kearney, Neb., May 14; thence to Julesburg, Colo. Duty in District of the Plains and
Utah till November, 1866. Mustered out November 3, 1866.
Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3