A line of seven army posts were established in 1848-49 after the Mexican War to protect the settlers of West Texas and included Fort Worth, Fort Graham, Fort Gates, Fort Croghan, Fort Martin Scott, Fort Lincoln and Fort Duncan.
On 15 June 1850, a group of 34 men (commanded by Andrés Zapata, Gaspar Salazar and Antonio Ramírez) met with Colonel Juan Manuel Maldonado to give the news that they had created a pass point at Piedras Negras, to the right of the Rio Grande, south of Fort Duncan; and having given it the name of: Nueva Villa de Herrera.
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Captain Sidney Burbank supervised the construction of Fort Duncan, which was named after Colonel James Duncan, who had fought in the Mexican War.