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Austro-Bulgarian confrontation

Tensions started over the respective zones of influence and military control in Djakova and Prizren. The Bulgarians maintained that they had the right to install a civilian administration on any territory they conquered, including outside their treaty border. Conrad, suspecting Bulgaria of harbouring ambitions to annex the whole region, sent troops to expel the Bulgarian civilian administrators. The arrival of Austro-Hungarian troops in areas already garrisoned by Bulgarian forces resulted in a military confrontation. On 27 February 1916, Bulgarian military commander Racho Petrov issued an ultimatum to the Austrians to immediately evacuate Kačanik (Kaçanik, southern Kosovo), on the frontier with Macedonia, resulting in a military standoff. General Conrad immediately halted all deliveries of war supplies and warned the Bulgarian High Command that unless local Bulgarian commanders abstained from interfering with the Austro-Hungarian administration, a conflict with his troops would be inevitable.