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The Bulgarians, using information from escaped prisoners of war, determined that Entente forces would engage in hostile actions west of lake Ohrid, in Monastir, Dobro Pole or Human. On 27 August, the 2nd and 3rd Bulgarian Divisions stationed at Dobro Pole were ordered to make emergency preparations, as new evidence indicated a frontal assault on Dobro Pole along with a secondary attack on Human. By 7 September, Dobro Pole was reinforced by one machine gun company, six battalions and ten heavy howitzers, the head of Army Group Scholtz General Friedrich von Scholtz then stated that the defensive measures made the defense of the front feasible. Scholtz had failed to take into account the departure of Bulgarian chief of staff Nikola Zhekov and his subsequent replacement by Georgi Todorov. Widespread insubordination and desertions also plagued the Bulgarian troops who refused to participate in fortification works; poor rations and fatigue contributed to the low morale.
A day prior to the Entente offensive, General Louis Franchet d'Espèrey laid out the final plan for the operation. The first phase consisted of a combined Franco-Serbian attack on the positions of the 2nd and 3rd Bulgarian Divisions, which was expected to create a breach of the front line in the area of Dobro Pole, while also posing a danger to the Bulgarian supply lines on river Vardar. Τhe 1,875 metres (6,152 ft) Dobro Pole ("Good Field") peak dominated the region, providing excellent observation points for the defenders. Dobro Pole was surrounded by a well-developed system of trenches which, in combination with the rough terrain, made the area impassable for wheeled transport. Dobro Pole was, however, lower and less steep than the mountains on other parts of the front that averaged 2,000 metres (6,600 ft).
A second Anglo-Franco-Hellenic force would then attack the Bulgarian 1st Army between the Vardar river and Lake Doiran, preventing it from forming new defensive positions in the area. The initial advance would allow the Armée d'Orient to progress in support of other units first to Prilep, Disma and Borran. In the meantime, an Anglo-Hellenic force would strike Mount Belasica, occupying the Rupel Pass. The Doiran sector had previously been subject to two major Entente offensives known as the First Battle of Doiran (August 1916) and Second Battle of Doiran (April–May 1917). Both engagements ended in decisive Bulgarian victories, forcing the Allies to limit their operations to small raids and harassing fire. Between 1916 and July 1918, Bulgarian defenses around Doiran underwent a period of considerable reorganization under the personal supervision of General Vladimir Vazov.
