Should military practitioners rely on any one historical theorist's insights when waging twenty-first century warfare? The answer is no. The future of global conflict will side with the owner of the best ideas, not necessarily the strongest competitor. Therefore, the military needs to not only out-fight opponents, it needs to out-think them. No one theorist provides enough insights to drive military thinking. Instead military practitioners should frame twenty-first century warfare around an admixture of theorists with an emphasis on those factors maximizing sophistication while remaining practical. For this reason the two theorists, Jomini and Clausewitz, offer ingredients to strengthen a military foundation for uncertain challenges.