“Oooh, horsies,” Dru Holley’s 7-year-old daughter, Andrea, exclaimed at a Juneteenth festival in 2018.

Those words that so many parents have heard for generations sparked Holley’s first feature-length documentary, “Buffalo Soldiers: A War on Two Fronts,” airing for the first time Monday on PBS.

The documentary explores the roles the members of six all-Black cavalry and infantry regiments, known as Buffalo Soldiers, played in conflicts in the American West and abroad following the Civil War.

Ryan Booth.

The documentary features Washington State University historian Ryan Booth, who studies the United States Indian Scouts. The scouts were Indigenous men acting as guides for the U.S. Army in the Indian Wars of the late 1800s.

In 2018, Holley’s daughter had spotted The Buffalo Soldiers of Seattle, a living history group that honors the regiments.

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