Dear Ms. Canfield,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Indexes to Revolutionary War Compiled Military Service Records; Compiled Service Records of Soldiers Who Served in the American Army During the Revolutionary War and Case Files of Pension and Bounty-Land Warrant Applications Based on Revolutionary War Service that may contain information about Jonathan or John Canfield’s service during the Revolutionary War. The last two series are digitized and online via the Catalog. If you need assistance conducting your search and/or for access to the Index, please contact the National Archives at Washington (RDT1) via email at firstname.lastname@example.org. More information is available on NARA’s website at https://www.archives.gov/research/military/american-revolution.
We hope this is helpful. Best of luck with your family research!