Butterfield Overland Mail in Indian Territory
The Butterfield Overland Mail in Indian Territory was part of the overall Butterfield Overland Mail service (1857–1861) created by Congress March 3, 1857. The route crossed Indian Territory from Colbert's Ferry to Fort Smith, Arkansas which was the Center for the Overland Mail's' 7th Division.
Source: Wikipedia — Butterfield Overland Mail in Indian Territory (CC BY-SA 4.0)