In Search of an Elusive Enemy: The Victorio Campaign, 1879-1880 represents another in a series of military case studies published by the Combat Studies Institute (CSI) at Fort Leavenworth, Kansas. This work examines the US Army's efforts in tracking down Victorio, the infamous Apache chief who raided large tracts of New Mexico and Texas at will, terrorizing the entire region. The key point made in this work is that it demonstrates the challenges of tracking and capturing or killing a small, irregular group of warriors in inhospitable terrain and among an alien culture. Although set in the late 19th century, this case study is still extremely relevant for today's Army. The commanders of the 9th and 10th US Cavalry Regiments faced a skilled adversary who used unconventional tactics and methods as well as an international border to seek sanctuary. However, it could just as easily have featured the stories of Osceola, Aguinaldo, Pancho Villa, or Osama bin Laden. The similarities to challenges that US and coalition forces face in Afghanistan and Iraq are striking. The commanders of the 19th century faced enormous challenges in the rugged terrain of the American Southwest as well as a skeptical and often hostile press. Again, officers and soldiers who have recently served in Afghanistan and Iraq will certainly see parallels here. As the US Army continues its efforts in combating terrorists where they live, the lessons found in this narrative are well worth revisiting. The goal of this and other special studies CSI has published is to provide historical examples of battles, campaigns, and historical figures from which leaders of today's Army can draw lessons and inspiration. Although the Victorio Campaign occurred more than a century ago, the tale still yields relevant points for the modern battlefield. The lessons here are not in using black powder weapons or Napoleonic tactics but in finding the key weakness in your enemy and adapting tactics and methods to exploit it. This work does not simply prescribe solutions but helps burnish the intellectual tools with which to diagnose the unexpected and create solutions using the hard-won experience of successful commanders of the past. The story of the Victorio Campaign does this and demonstrates that even under the most arduous of circumstances the American soldier will persevere until victory is won.