Papers of Theodore J. Eckerson (1820-1906), primarily relating to his military career, but also including letters from Benjamin L. E. Bonneville (1796-1898) and Ulysses S. Grant (1822-1885). Eckerson, who emigrated to Oregon in 1849, was in the U.S. Army for most of his adult life. He fought in the Mexican-American War and, in the 1850s, supplied Euro-American volunteers who were fighting Native peoples in the Pacific Northwest.

Collection includes typescript biographical and autobiographical documents about Pierre Chrysologue Pambrun, Thomas Pambrun, Jr., Alexandre (Alexander) Pambrun and Andre (Andrew) Dominique Pambrun; letters and documents relating to an error in several histories regarding Pierre Pambrun and Captain Bonneville; and photostat newspaper clippings regarding the Pambrun family.