Dear Ms. Yuhasz,
Thanks for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Court Martial Case Files, 12/1800 - 10/1894 in the Records of the Office of the Judge Advocate General (Record Group 153) that includes a case file for Downs, Enoch -- Citizen. For access to and/or copies of these records, please contact the National Archives at Washington, DC (RDT1) via email at email@example.com.
We hope this information is helpful. Best of luck on your research!