The Jacob Jennings Brown papers (707 items) consist of military, political, and family correspondence of Jacob Jennings Brown, American general in the War of 1812. Of special note are several pre-war letters written to New York Governor Lewis Morris, concerning land along the Black River in 1806, and about lobbying for the financing of road-building operations in the Brownville area in 1804 and 1805. Also important is the substantial correspondence in 1814, between Brown and his subordinate, Winfield Scott, regarding plans and intelligence reports outlining the Niagara Campaign. Other notable correspondents are DeWitt Clinton, General James Miller, General John A. Dix, and John C. Calhoun. Many post-war letters comment on national and state politics between 1823 and 1827, including letters from New York Senator Ambrose Spencer, and an account of a quarrel between Colonel Joseph L. Smith of Green Bay and General Alexander Macomb of Detroit.
The bulk of the letters and documents from after Brown's death are the 169 letters from his son -in-law Edmund Kirby, who was one of Brown's executors. These letters deal with Kirby's business interests, particularly in the development of Dexter, New York; routine army matters in regard to his role as paymaster of the army; and letters concerning the settlement of Brown's estate. Fifty-five additional documents and business papers from 1830 to 1851 cover the same topics.