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Dear Mr. Cox,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Letters Received, 1805 - 1889 in the Records of the Adjutant General's Office, 1762 - 1984 (Record Group 94) and located 23 file units pertaining to Fort Belknap during the 1840s & 1850s. We also located 8 series of War Department Western Division or the Department of Texas for 1840s & 1850 in the Records of U.S. Army Continental Commands (Record Group 393) but there was nothing specific about Fort Belknap. For access to the 6 textual series, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org. For access to the 2 map series, please contact the National Archives at College Park - Cartographic (RDSC) via email at email@example.com.
We hope this is helpful. Best of luck with your research!