Dominic Tierney’s How We Fight: Crusades, Quagmires, and the American Ways of War is an unusual achievement. It is a provocative scholarly book about the U.S. approach to war that was written for a broad non-academic audience. For the academic and layperson alike, it succeeds in establishing that the heated controversies of the moment follow a familiar pattern. Indeed, it is impossible to read Tierney’s book without reflecting upon recent events. The Obama administration has struggled mightily to define (and redefine) the U.S. mission in Afghanistan; it has announced deep defense cuts though the United States remains at war; and with the shift in defense budgetary priorities, it will trim the very capabilities (for counterinsurgency) that U.S. leaders had once viewed as keys to success in Iraq and Afghanistan. But what led the administration finally to act? Was the administration recognizing belatedly that the public would not tolerate nation-building efforts? Or had the clock simply run out on the U.S. effort?