How to obtain engagement record of WWI  26th Division [Yankee Division] 101st Infantry  Company C  ?

You can look at records at the NARA facility at College Park, MD.  NARA Record Group 120 for division level records and Record Group 391 for regimental level records. Both will be different in content but will prove complimentary to the subject.

You can ask a NARA archivist to recommend a specific entry or series; or hire an independent researcher to look it up for you.

Dear Mr. Dow,

The National Archives at St. Louis has morning reports that can help trace the specific history, movement, and changes of the unit. If you are interested in requesting this information you may email the National Archives at St. Louis at stlarr.archives@nara.gov with your unit information.

Additionally, the National Archives at College Park, MD will likely hold operational records for the 26th Infantry Division. We suggest that you may wish to submit an inquiry to archives2reference@nara.gov for further review.

Regarding an individual’s personnel record, you also may wish to contact the County Recorder of Deeds in the county where your father resided following the war. Many veterans registered their discharges at the county level of government after their service. While these records in no way replace an individual’s personnel file, they do provide some basic information regarding their service.

As we commemorate the World War I centennial the National Archives has compiled a number of resources that researchers may find of assistance. You can view these listings here:   https://www.archives.gov/topics/wwi#event-/timeline/item/archduke-assassination.

We hope this information will be of assistance in your continuing research.

Thank you!

Try reaching out to the MA Archives, they had my Great Granduncle’s Service records.