Military historian Caleb Carr’s groundbreaking work anticipated America’s current debates on preemptive military action against terrorist sponsor states, reorganization of the American intelligence system, and the treatment of terrorists as soldiers in supranational armies rather than as criminals. Carr’s authoritative exploration demonstrates that the practice of terrorism, employed by national armies as well as extremists since the days of ancient Rome, is ultimately self-defeating. Far from prompting submission, it stiffens enemy resolve and never leads to long-lasting success. Controversial on its initial publication in 2002, The Lessons of Terror has been repeatedly validated by subsequent events. Carr’s analysis of individual terrorist acts, and particularly of the history of the Middle East conflict, is fundamental to a deep understanding of the roots of terrorism as well as the steps and reforms that must be taken if the continuing threat of terrorist behavior is to be met effectively today and, finally, eradicated tomorrow.