11º Ejército
The Central Powers could initially oppose these forces with the Bulgarian First Army, German Eleventh Army and Bulgarian Second Army in total 172 infantry battalions, c. 900 artillery pieces. In addition there was also the 10th Bulgarian Infantry Division and the forces protecting the Aegean coast from the river Struma to the border with the Ottoman Empire – 25 infantry battalions, 31 artillery batteries and 24 machine guns.