Maartje Abbenhuis is Professor in Modern History at the University of Auckland, New Zealand. She is the author of several books on the international history of the nineteenth century and the First World War, including An Age of Neutrals (2014) and The First Age of Industrial Globalization (co-authored, 2019).Ismee Tames is Professor in History at Utrecht University and Senior Researcher at NIOD, Institute for War, Holocaust and Genocide Studies in Amsterdam, The Netherlands. Her most recent publication is Fighters across Frontiers: Transnational Resistance in Europe, 1936-48 (co-edited with Robert Gildea, 2020).