Dear Ms. Blackstock,
Thank you for posting your request on History Hub!
Because Indian Affairs were managed out of the War Department until 1824, many of the records from the late-18th and early-19th century are commingled. In addition, some records related to this time period were not created during the Revolutionary War, but were created by the Department of War beginning in the 1890s from extant records among its files in an attempt to create substitutes for records destroyed by fires in 1800 and 1814.
We searched the National Archives Catalog and located the Numbered Record Books, documenting 1775-1798 in the War Department Collection of Revolutionary War Records (Record Group 93) that contains lists of soldiers from North Carolina and South Carolina that may be relevant to your research. Some of these records have been digitized and may be viewed online using the Catalog. For more information about the non-digitized records and about other War Department records related to the Revolutionary War, please email the National Archives at Washington, DC - Textual Reference (RDT1) at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
Next, we located a transcription of The Catawba Indian Company in Sumter's Brigade, which is a paybill for Captain Thomas Drennan’s company of Catawba Indians in the collections of the South Carolina Department of Archives and History. We suggest that you contact them directly for further assistance.
Finally, the York County (South Carolina) Genealogical & Historical Society provides some information about the Catawba Indians in the Revolutionary War on their website, and the North Carolina Government & Heritage Library at the State Library of North Carolina has an NCPedia entry related to The Cherokees' and Catawbas' Stance in the Revolutionary War that may be of interest to you.
We hope this is helpful. Best of luck with your family research!
[Some information provided by Cody White, Subject Matter Expert]