John Sislin and Frederic Pearson have written a fine book that addresses a complex and understudied issue: the role of arms in ethnic conflict. While it is abundantly clear that arms and ethnic conflict are closely intertwined, we have little systematic knowledge on the nature of the relation. What kinds of weapons—tanks versus small arms, say—play the greatest role? Whatever the weapon, how does its influence vary at different stages in the process of ethnic conflict? As unpleasant as the thought might be, are there conditions under which armaments play a positive role in such conflicts—for example, by promoting a situation of stalemate or bringing about outside humanitarian intervention? The signal contribution of this compact volume is to shed much-needed light on these and many other questions.