 By the end of the day, Bulgaria lost approximately 40–50 percent of the 12,000 soldiers involved in the battle, including 3,000 prisoners of war, 2,689 dead and 50 out of the initial 158 artillery pieces.Entente casualties amounted to 1,700 Frenchmen and 200 Serbians killed in action.On the morning of 16 September, the Serbians overran the Kozjak mountain range and the Golo Bilo peak.