Innovation shapes wars, and twelve studies by former faculty members of West Point's United States Military Academy examine specific cases of past and present military innovation. The complex, competitive, and dynamic environment that defines war drives combatants to seek solutions to potentially lethal problems. As some solutions prove effective, gain traction, and win emulation, they follow a path of innovation. The chapters address a broad array of innovations, including in weapon technology, strategy, research and development philosophy, organization of the military instrument, and leveraging maps for strategic goals. Geographically, the examples in this volume span four continents and the Mediterranean Sea, and chronologically they proceed from the twelfth century to the twenty first. Collectively, the studies point to the interconnected value of pursuing constructive solutions to challenges, networking interdisciplinary forms of knowledge, appropriately balancing expectations and capabilities, and understanding an innovation as a journey rather than as an episodic event.