Nearly a century before the Vietnam War, the United States undertook one of its first military interventions in East Asia. It was not a full-scale campaign, and it lasted only a single day. Its opponent was not a modern army but the indigenous Paiwan people of southern Taiwan. Yet the expedition exposed a problem that would become familiar in later conflicts: the limits of military power against an elusive enemy fighting on its own terrain. Known as the Formosa Expedition of 1867, this little-remembered operation ended in an embarrassing defeat for the United States Navy.

United States Marines and sailors attacking the Paiwan natives of southern Taiwan. Credit: Wikimedia Commons
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