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Dear Mr. Gates,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Indexes to the Carded Records of Soldiers Who Served in Volunteer Organizations During the Civil War in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94). We searched the index and located a card for John Retz, a private in Company H, 6th Indiana Cavalry. The index card has been digitized and can be viewed online through the Catalog here.
The listing for him in the index indicates that there should be a record for him in the series Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the American Civil War. His record is not available online. To order copies of his record, please fill out a NATF Form 86 and mail it to Archival Operations Washington D.C., Form 86 – Military, National Archives and Records Administration, 700 Pennsylvania Avenue NW, Washington, DC 20408-0001. There may also be a pension file for him or his survivors which could provide additional information about his service and other biographical details about him. To request a search for a pension file, please fill out and submit a NATF Form 85. You can also place your orders online using eservices.archives.gov. For more information, please see Requesting Copies of Older (pre-WWI) Military Service Records. You may also email firstname.lastname@example.org for questions about these records.
We also located a series titled Registers of Federal Prisoners of War Confined at Andersonville Prison, Georgia in the Records of the Commissary General of Prisoners (Record Group 249) that was microfilmed as National Archives Microfilm Publication No. M1303. Since M1303 has not been made available through the National Archives Catalog, you may access the descriptive pamphlet and a list of National Archives facilities that have the microfilm using the Microfilm Catalog. M1303 has also been digitized by FamilySearch and Ancestry. These sites can be accessed for free at any National Archives location. Some state, public and university libraries also offer access to their patrons.
We hope this information is helpful. Best of luck with your family research!