This volume contains essays on the diplomatic and military relations between Austria-Hungary and Bulgaria in the First World War including their alliance politics towards other states and their aspirations on the Balkan Peninsula. The volume grew out of the presentations at the 2015 conference of the Bulgarian-Hungarian History Commission held in Sofia; a large portion of these studies represent attempts to transcend the politics of national grievance and self-victimization, and to avoid the canonization of national myths or the deflection of responsibility. At the same time, authors of the studies try to emphasize the alternatives the politicians of the period could have chosen, and how and why certain figures might bear responsibility for particular outcomes.