The Hellenic Army, after the victory at Kilkis-Lachanas, continued their advance north and successfully engaged the Bulgarians at Lake Doiran.

The Bulgarian army had retreated to the lake, after having destroyed the bridges of Strymon River and burned the town of Serres.

[5] As a result of their subsequent defeat, the Bulgarian forces retreated further north.

When the Evzones captured the train station of Doiran, fearing that they would be encircled, retreated further north.

Another part of the Greek army marched eastern to capture Drama and Western Thrace, while ships of the Greek navy with an amphibious operation were landed at Kavala.