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Austro-Bulgarian confrontation

On 15 March, the Austro-Hungarians issued an order to secure the districts of Prijepolje, Novi Pazar, and Kosovska Mitrovica to their governorate, three districts acquired by Serbia during the First Balkan War. Bulgarian actions on the ground persisted, leading to a second crisis, with Conrad demanding diplomatic assistance against Bulgarian violations. The German chief of staff, General Erich von Falkenhayn, ordered Mackensen to mediate between the two parties, consequently Mackensen visited Sofia to meet Ferdinand and Prime Minister Vasil Radoslavov. The proposed German compromise was accepted and, on 1 April 1916, an agreement on a demarcation line was signed between the Austro-Hungarian and Bulgarian high commands.