This Companion is designed to provide scholars and graduate students with a comprehensive and authoritative overview of research on one of the most destructive conflicts in European history. It brings together leading scholars in the field to synthesize the range of existing research on the war. "The complexity of the War makes it a challenging subject for both scholars and undergraduates, but this collection of articles comprehensively and authoritatively reviews current historiographical opinion to shed new light over the field." Mariusz Beclawski, Kozminski University, Poland, Journal of the Australian and New Zealand Association for Medieval and Early Modern Studies