He studied at the Imperial Russian General Staff Academy in Saint Petersburg; he graduated with honours in 1907 and returned to Bulgarian service.
During the First Balkan War of 1912–1913, Drangov headed a brigade on the Thracian front, defeating the Ottomans at Çatalca and during the Siege of Adrianople.
He also fought at the Romanian front in Dobruja before he was dispatched back to Macedonia, where his unit guarded the River Crna meander.
His son Kiril was a prominent activist of the Internal Macedonian Revolutionary Organization, who was killed by the communist authorities in Bulgaria after the Second World War.
His grandson, Boris, graduated from the Sofia Theological Seminary in 1976 and was invited to Toronto to head the Macedono-Bulgarian St. George Orthodox Church.