The Missouri in the Civil War Message Board

Where to research transfer orders?

According to SOS soldier database, Milton Thornton enlisted in Captain Richard Chitwood's Company G of the 8th MSM Cavalry. He served with this unit until November 11, 1864, when he was transferred to Captain Burch's Company M in Springfield. Fold3 indicates he was transferred to Company K. Regardless, I'm seeking any record of who ordered the transfer. Any ideas on a source? Thanks.