The First Battle of Agua Prieta was fought between the supporters of Francisco Madero and federal troops of Porfirio Díaz in April 1911, at

Agua Prieta Agua Prieta (English: ''Dark Water'', Opata: ''Bachicuy'') is a town in Agua Prieta Municipality in the northeastern corner of the Mexican state of Sonora. It stands on the Mexico–U.S. border, adjacent to the town of Douglas, Arizona. The mu ...

, Sonora, in the initial phase of the Mexican Revolution.Cindy Hayostek, "Douglas", Arcadia Publishing, 2009, p. 27
The battle was significant in that it was the first time railroads were used by the rebels to gain surprise and that US forces got involved in the fighting. After United States troops in

Douglas, Arizona Douglas is a city in Cochise County, Arizona, United States that lies in the north-west to south-east running Sulpher Springs Valley. Douglas has a border crossing with Mexico at Agua Prieta and a history of mining. The population was 16,531 i ...

were attacked by the Federal Army, the Americans responded by intervening in the battle, which allowed the rebels to briefly take control of the town. The town was recaptured by federal troops two weeks later once additional reinforcements arrived.Frank McLynn, "Villa and Zapata", Basic Books, 2000, p. 85 This battle was a turning point in the Mexican revolution.

References

{{coord missing, Sonora

1911 in Arizona Territory April 1911 events