Thanks to its recent experience of quagmires that drain into simmering truces, America has forgotten that triumph is the proper way to end a war, argues this brash study of military blowouts. Surveying six conflicts, from the Persian invasion of ancient Greece to WWII, historian Lewis (Early Greek Lawgivers
) contends that lasting peace requires a shattering victory, “a display of overwhelming force” that “expose[s] the physical and ideological bankruptcy” of the losers and precipitates “an immediate collapse in [their] will to fight.” Lewis's analysis of war as a psychological struggle and “clash of moral purposes” is lucid and forceful; it's especially telling in his incisive account of Sherman's march through Georgia, and especially provocative in his defense of the atomic bombings of Japan. (“To break the Japanese leaders out of their ideological blinders... American leaders needed to kill a lot of Japanese in a visibly shocking way.”) He's less cogent when he tries to distill profound moral purposes from the murk of the Second Punic War or Roman emperor Aurelian's squabble with Queen Zenobia of Palmyra. Lewis's tight yoking of military success with moral superiority sometimes veers close to the notion that might makes right. (Mar.)