In the beginning of August 1916 three French and one British divisions with 45,000 men and 400 guns launched an offensive against the Bulgarian positions at Lake Dojran, defended by the Second Thracian Infantry Division. The attack began on 9 August with heavy artillery fire on the positions of the 27th Chepino Regiment and 9th Plovdiv Regiment. All four attacks that followed - on 10, 15, 16 and 18 August were repulsed by the Second division and the Allies were forced to retreat to their original positions with heavy casualties.