’Little Phil,’ a ’Bad Old Man’, and the ’Gray Ghost’: Hybrid Warfare and the Fight for the Shenandoah Valley, August–November 1864

During the first decade of the twenty-first century, defense analysts identified the emergence of “hybrid warfare” as a compelling threat to American national security. Generally speaking, hybrid warfare consists of “conflict involving a combination of conventional military forces and irregulars … which could include both state and non-state actors, aimed at achieving a common political purpose.” This paper uses as a case study of hybrid warfare a specific campaign in the U.S. Civil War where conventional and unconventional operations were significant factors. It considers Maj. Gen. Philip Sheridan’s efforts to defeat the Confederate hybrid threat in Virginia’s Shenandoah Valley, the particular dynamics and challenges he confronted, and the factors that enabled him to prevail. By doing so, it will both draw on and contribute to the growing body of literature on the campaign and the challenge of countering hybrid warfare.