The Mexican period of Black Seminole history officially began July 12, 1850,
when 309 Black Seminoles, Seminoles, and Kickapoos crossed the Rio Grande and
presented themselves to the local military commander in Piedras Negras, across
the river from Eagle Pass, Texas. Coacoochee had already made preliminary
negotiations with the Mexicans for land in exchange for the allies’ services.
The commander at Piedras Negras gave the immigrants provisional permission to
stay while awaiting formal confirmation from Mexico City.
Reports of the Committee of Investigation Sent in 1873 by the
Mexican Government to the Frontier of Texas 408, Porter
Black 131, Mulroy 56-58.