The preparatory artillery bombardment of Bulgarian and Central Powers positions for the Battle of Dobro Pole began on 14 September. The following day, the French and Serbians attacked and captured their objective. On 18 September, the Greeks and the British attacked but were stopped with heavy losses by the Bulgarians in the Battle of Doiran. The Franco-Serbian army continued advancing vigorously and next day, some Bulgarian units started surrendering positions without a fight and the Bulgarian command ordered a retreat.