Waging war has historically been an almost exclusively male endeavor. Yet, over the past several decades women have joined insurgent armies in significant and surprising numbers. Why do women become guerrilla insurgents? What experiences do they have in guerrilla armies? And what happens to these women when the fighting ends? Women in War answers these questions while providing a rare look at guerrilla life from the viewpoint of rank-and-file participants. From 230 in-depth interviews with men and women guerrillas, guerrilla supporters, and non-participants in rural El Salvador, Jocelyn Viterna investigates why some women were able to channel their wartime actions into post-war gains, and how those patterns differ from the benefits that accrued to men. By accounting for these variations, Viterna helps resolve debates about the effects of war on women, and by extension, develops our nascent understanding of the effects of women combatants on warfare, political violence, and gender systems. Women in War also develops a new model for investigating micro-level mobilization processes that has applications to many movement settings. Micro-level mobilization processes are often ignored in the social movement literature in favor of more macro- and meso-level analyses. Yet individuals who share the same macro-level context, and who are embedded in the same meso-level networks, often have strikingly different mobilization experiences. Only a portion are ever moved to activism, and those who do mobilize vary according to which paths they follow to mobilization, what skills and social ties they forge through participation, and whether they continue their political activism after the movement ends. By examining these individual variations, a micro theory of mobilization can extend the findings of macro- and meso-level analyses, and improve our understanding of how social movements begin, why they endure, and whether they change the societies they target.