His research combines themes of war, genocide, and forced migration, and particularly focuses on the Nazi era. His doctoral research examined the German retreat onto its own territory following years of brutalised fighting on the Eastern Front, and asked if the Wehrmacht’s behavioural patterns, taught during the fighting in the Soviet Union, could also be observed during the final battles in Germany. This led to his first monograph, Violence in Defeat: The Wehrmacht on German Soil, 1944-1945 (Cambridge University Press, 2021). At the same time, He looked at the flight and expulsion of East Prussians from their province in the years 1944-1948, which, beyond a number of articles, has led to the co-edited volume (with Michal Palacz) A Transnational History of Forced Migrants in Europe: Unwilling Nomads in the Age of the Two World Wars (Bloomsbury Academic, 2022). He is associate editor of the Journal of Slavic Military Studies and served as historical consultant.
Willems, B. (2023). The Wehrmacht’s complicity in late-war genocide: The Palmnicken massacre and the military in East Prussia, 1944–1945. Holocaust and Genocide Studies, 37(3), 423–437.
Willems, B. (2023). The Battle of Königsberg. History Today, 73(8), 1–14.
Willems, B. (2023). Book review: Extreme Violence and the ‘British Way’: Colonial Warfare in Perak, Sierra Leone and Sudan by Michelle Gordon. War in History, 30(2), 219–223.
Bird, S., Fulbrook, M., Rauch, S., & Willems, B. (2023). Compromised identities?: Reflections on perpetration and complicity under Nazi rule. In Perpetration and complicity under Nazism and beyond (pp. [número de páginas si se desea]). London: Bloomsbury Academic.
Bird, S., Fulbrook, M., Rauch, S., & Willems, B. (2023). Conclusion. In Perpetration and complicity under Nazism and beyond (pp. [número de páginas si se desea]). London: Bloomsbury Academic.
Bird, S., Fulbrook, M., Rauch, S., & Willems, B. (2023). Introduction: 'Compromised identities?'. In Perpetration and complicity under Nazism and beyond: Compromised identities? (pp. [número de páginas si se desea]). London: Bloomsbury Academic.
Willems, B. (2023). Public execution in your community: The summary courts of 1945 Germany. In Perpetration and complicity under Nazism and beyond (pp. [número de páginas si se desea]). London: Bloomsbury Academic.
Fulbrook, M., Willems, B., Bird, S., & Rauch, S. (Eds.). (2023). Perpetration and complicity under Nazism and beyond: Compromised identities? London: Bloomsbury Academic.