Page "Balkan Wars" Paragraph 30

Greece had also allowed the Bulgarians to control the stretch of the Thessaloniki-Constantinople railroad that lay in Greek-occupied territory, since Bulgaria controlled the largest part of this railroad towards Thrace.

After the end of the operations in Thrace — and confirming Greek concerns — Bulgaria was not satisfied with the territory it controlled in Macedonia and immediately asked Greece to relinquish its control over Thessaloniki and the land north of Pieria, effectively handing over all Aegean Macedonia.

These unacceptable demands together with the Bulgarian refusal to demobilize its army after the Treaty of London had ended the common war against the Ottomans and alarmed Greece, which decided also to maintain its army's mobilization.