The bounty land books, would probably tell you very little about the individuals involved. For a general discussion of War of 1812 bounty land warrants see:
I think that Isaac or Sabina Pierce's application for a Bounty Land Warrant would probably provide the most information. Those records are at the NARA in Washington DC.
Dear Ms. Lyon,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled Military Bounty Land Warrants under the Act of 1812 (M848) in the Records of the Bureau of Land Management (Record Group 49) that may include a file for Sabina Pierce. For more information about these records, please contact the National Archives at Washington, DC (RDT1) via email at email@example.com.
We also located the series War of 1812 Pension and Bounty Land Warrant Application Files and
Bounty-Land Warrant Application Files, ca. 1800 - ca. 1900 in the Records of the Department of Veterans Affairs (Record Group 15) but were unable to locate files for Sabina Pierce or Isaac Pierce. Plus, we located the series Indexes to the Carded Records of Soldiers Who Served in Volunteer Organizations During the War of 1812 and Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the War of 1812 in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94) but were unable to locate any cards pertaining to an Isaac Pierce who fought with a Virginian unit.
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.
In addition, we suggest that you review the NARA web page about Accessing Land Entry Records for more information.
We hope this is helpful. Best of luck with your research!