The volume focuses on violence during the breakdown of East Central European states brought by one of the most violent periods in modern European history: from the start of the Great War in 1914 until 1923 when Europe, finally, achieved peace after a series of civil conflicts and interstate wars. The contributors offer several case studies that cover the vast region stretching from the Baltic states to Hungary. They explore different types of violence against its civilian populations with a particular focus on communal violence committed by civilians onto their neighbors. They suggest that disintegration of state power brought by the Great War was a key condition that produced violence. Yet the process of post-WWI state building was equally or more violent as nascent East Central European states institutionalized the use of violence to achieve their political agendas.