The long-planned Allied offensive in what was now the Macedonian front had been delayed for 20 August, but on 17 August, the German and Bulgarian forces attacked the Serbian positions north of Florina, which they captured on the same night. The Central Powers' advance continued in the west, where they clashed not only with the Serbians around Kajmak?alan, but also with the Greek 18th Infantry Regiment, as well as in eastern Macedonia, where Bulgarian forces crossed the Nestos river at Chrysoupolis, and approached Kavala. This led the Allies to cross the Strymon as well, but their first attacks were held by the Bulgarians.
