During the First World War , Montenegro was conquered by the Austro - Hungarian forces in 1915 .
The area was taken by the Kingdom of Montenegro in the 1912 First Balkan War except Prizren area , conquered by Kingdom of Serbia .
During the First World War , Kingdom of Montenegro was conquered by the Austro - Hungarian forces in 1915 .
The area was taken by the Kingdom of Montenegro in the 1912 First Balkan War except Prizren area , conquered by Kingdom of Serbia .