Those five companies were mustered as a battalion in April 1865 under the command of Lieutenant Colonel Hiram J. Lewis, and sent to St. Louis, Missouri. They were then sent to Holden, Missouri, to guard workmen on the Pacific Railroad until June 21.
In April 1865, five companies were combined into a battalion led by Lieutenant Colonel Hiram J. Lewis and sent to St. Louis, Missouri.  They later moved to Holden, Missouri, to protect railroad construction workers until June 21st.