This is a beautifully written ethnographic account of why and how campesinos supported, if not joined, the FMLN. I found two of Wood's claims particularly compelling. First, she argues that insurgent support was motivated primarily by moral outrage. This is an explicit critique of the rational choice paradigm, which posits that rational actors will not support an insurgency when it is possible for them to "free ride", that is, gain access of a public good like agrarian reform without exerting any effort. Wood shows, however, that, at great personal risk, the campesinos continued to support the FMLN even when they already had the option to "free ride." She claims that the moral calculus of campesinos was shaped not by changes in their welfare but by their exposure to liberation theology.
Second, Wood shows that participation in insurgent collective action is a transformative and empowering experience. The beliefs and behaviors of the insurgents and their supporters changed as they became more involved in the movement. This is evident in the political cultures that emerged after the conflict. She cites evidence that participants in the insurgency were relatively more committed to politics and social justice than non-participants.
This book exemplifies the important contributions that ethnographic research can make to political science. Furthermore, her empathy and respect for the campesinos is undeniable. Academia would be a better and kinder place if all researchers treated their "subjects" with such regard. My only quibble is that I wish she were a little more systematic with her historical analysis. It would also have been better if Wood had provided a more substantial argument about the generalizability of her argument. These are minor critiques, however. Anyone interested in the insurgency, social movements, and civil wars should read this fine book.