The Serbs and the Greeks had a military advantage on the eve of the war because their armies confronted comparatively weak Ottoman forces in the First Balkan War and suffered relatively light casualties, while the Bulgarians were involved in heavy fighting in Thrace. The Serbs and Greeks had time to fortify their positions in Macedonia. The Bulgarians also held some advantages, controlling internal communication and supply lines.
The Serbs and the Greeks had a military advantage on the eve of the war because their armies confronted comparatively weak Ottoman forces in the First Balkan War and suffered relatively light casualties while the Bulgarians were involved in heavy fighting in Thrace. The Serbs and Greeks had time to fortify their positions in Macedonia. The Bulgarians also held some advantages controlling internal communication and supply lines.