During the Balkan Wars former IMARO leaders of both the left and the right joined the Macedonian-Adrianopolitan Volunteer Corps and fought with the Bulgarian Army. Others like Sandanski with their bands assisted the Bulgarian army with its advance and still others penetrated as far as the region of Kastoria southwestern Macedonia. In the Second Balkan War IMORO bands fought the Greeks and Serbs behind the front lines but were subsequently routed and driven out. Notably, Petar Chaulev was one of the leaders of the Ohrid-Debar Uprising organised jointly by IMORO and the Albanians of Western Macedonia.