In late July 1846, McCulloch’s company discovered that Juan Seguín was somewhere in the territories north of Monterrey, commanding a small Mexican cavalry unit known as the Escuadrón Auxiliar de Béjar. The Escuadrón consisted of displaced Tejanos who, like Seguín, had fled into northern Mexico during the years since 1836—pushed out by increasing Anglo violence against Mexican Texans—and in the process had been branded by Anglo-Texans as traitors for seeking refuge in Mexico.
