08/26/2026
What Happened Wednesday: Buffalo Soldiers at the Battle of Ambos Nogales
On August 27, 1918, soldiers of the 10th U.S. Cavalry, the famed Buffalo Soldiers, went into battle on American soil along the Arizona-Mexico border.
But the Battle of Ambos Nogales did not erupt out of nowhere.
For nearly a decade, the Mexican Revolution had created instability along the border. Rival factions fought for control of Mexico, weapons crossed the international line, and American troops regularly patrolled the region. In 1915, Mexican authorities erected an eleven-wire fence along International Street in an effort to control movement and prevent weapons from reaching enemy forces. It was removed later that year, but tensions continued.
Those tensions grew even sharper after the United States entered World War I in 1917. The intercepted Zimmermann Telegram had revealed Germany's proposal for an alliance with Mexico if Mexico entered the war against the United States. American military intelligence also received reports of German activity around Nogales, although historians continue to debate the extent of direct German involvement in the fighting.
By August 1918, the border situation was increasingly volatile. Mexican troops had established positions overlooking the American side, armed men were gathering around Nogales, and U.S. forces were closely watching the international line. The 10th Cavalry was among the units assigned to patrol and defend the region.
At approximately 4:10 p.m. on August 27, a Mexican civilian attempted to cross the international boundary without stopping for inspection. A U.S. customs official ordered him to halt. The confrontation quickly escalated into gunfire.
Within minutes, the international boundary had become a battlefield.
Lieutenant Colonel Frederick J. Herman of the 10th Cavalry rushed his Buffalo Soldiers forward, while elements of the 35th Infantry joined the fight. Troops of the 10th Cavalry advanced against positions overlooking Nogales. During the battle, Captain Joseph D. Hungerford of Troop C was killed while leading his men, and First Sergeant James T. Penny assumed command of the troop.
The fighting continued until Mexican officials requested a conference and a cease-fire was arranged. By the following day, American and Mexican commanders had resolved the immediate confrontation.
The Battle of Ambos Nogales also had a lasting physical consequence.
Although Mexican authorities had briefly erected a fence between the two Nogales communities in 1915, the violence of August 1918 helped lead to the construction of a permanent border barrier, creating a much more visible division between Nogales, Arizona, and Nogales, Sonora.
The Buffalo Soldiers of the 10th Cavalry are often remembered for their service during the Indian Wars, but their story continued far beyond the nineteenth-century frontier. At Ambos Nogales, they were still serving on America's western border, this time amid the Mexican Revolution and the global tensions of World War I.
That’s what happened this week in U.S. Cavalry history.
Sources:
U.S. Army, Fort Huachuca Museum, The 10th Cavalry and the Battle of Ambos Nogales, historical publications on the 10th Cavalry and border service.
National Park Service, historical materials on the Battle of Ambos Nogales and the U.S.-Mexico border during World War I.
Arizona Memory Project, Arizona State Library, Archives and Public Records, historical records and newspaper material concerning Ambos Nogales.
Library of Congress, materials concerning the Mexican Revolution, U.S.-Mexico border relations, and the Zimmermann Telegram.
National Archives and Records Administration, records relating to U.S. military operations along the Mexican border during the Mexican Revolution and World War I.