 It rectified the border between the two countries in Bulgaria's favour in order to bring Bulgaria into the First World War on the side of the Central Powers.A defensive alliance between Bulgaria and Turkey had been concluded on 19 August 1914, but negotiations for Bulgaria's intervention in the war did not begin between the two parties until May 1915.It quickly became clear that Bulgaria sought a rectification of the border, and Germany and Austria-Hungary put pressure on the Ottomans to accept.