This video from the USA says about itself:
Why the U.S. Army Guarded the 23 Remaining American Buffalo
16 December 2016
In 1882, General Philip Sheridan’s expedition to the protected buffalo haven in Yellowstone National Park revealed a gruesome reality: Poachers were continuing to slaughter the last remnants of America’s big-game icon. He then called in the U.S. Army to intervene.