Women have been part of modern revolutions since the American Revolution against Great Britain. Most descriptions and analyses of revolution relegate women to a supporting role, or make no mention of women's involvement at all. This work differs from prior efforts in that it will explore one possible explanation for the successes of three revolutions based upon the levels of women's support for those revolutions. An analysis of the three cases (Ireland, Russia, and Nicaragua) suggests a series of hypotheses about women's participation in revolution and its importance to revolutions' success.