The dissertation discusses the work of women`s organization for peace in Colombia, in the context of the broadening of internationals security. Contemporary international security studies question the monopoly of the State as the subject of security. Gender violence is one of the main components of a comprehensive concept of international security, developed since the 1990`s. Security Council Resolution 1325/2000 recognized the links between women, war and security. The gender dimension of the culture of violence is translated in the creation of frontiers between protectors and protected. The vulnerability of protected beings justifies the power of protector ones, exercised in military and strategic capabilities. The hegemonic masculinity is construed in opposition to a concept of passive, politically alienated and inherently threatened femininity. As challenge to these stereotypes, international agencies have been highlighting the importance of strengthening women`s groups and projects at the local level. This is the context of creation of two Colombian organizations, called Ruta Pacífica de Mujeres and Iniciativa de Mujeres por la Paz. These are networks of women`s organizations making visible the impact of the armed conflict on the lives of Colombian women. The dissertation asks whether and how their political actions and discourses break with the masculine constitution of power that justifies the militarization of civil life in the name of the protection of feminine vulnerable identities.