The countries involved were Albania, Bulgaria, Greece, Germany, Romania, Bessarabia, Southern Dobruja, Transylvania, Yugoslavia, Serbia, Ottoman Empire, and Voivodina. Most of the battles in the Balkans were naval. The causalities in the Balkans were 275,000 soldiers in Serbia, 26,000 from Greece, 1.1 million from Austria- Hungary, 87,000 from Bulgaria, 2.1 million from Germany, 770,000 from Ottoman Empire.