Moreover, always instigated by their desire of supremacy, and stirred up by Vienna and Berlin, the Bulgarians thought that the moment had come to annihilate the Serbians and Greeks. So they made the sudden attack of June 17-30, 1913, on their former allies. But the wary Serbians and Greeks were ready for the encounter. Roumania, as little inclined to tolerate Bulgarian supremacy as Greece or Serbia, marched her troops to within ten kilometres of Sofia. The Bulgarians were crushed by the Serbians at Bregalnitza, and were compelled to sign, on August 10th, 1913, the treaty of Bukarest. But from that moment, animated by a boundless hatred of their conquerors, they had but one desire, and that was to take vengeance on the victors, one after the other, and above all to destroy the treaty of Bukarest at the first favourable opportunity. Hence 1º. The treaties made by Sofia with Berlin and Constantinople, before April, 1914, as M. Radoslavoff has disclosed (see _Havas_, quoted by _Le Petit Parisien_, 26th March, 1916, and _Le Temps_, 10th April, 1916). 2º. Bulgaria’s participation in the European war on the side of Germany, whose plans for the future, like the Bulgarian ambitions, were threatened by the consequence of the treaty of Bukarest (_see_ Chapter II, § 1). * * * * * An examination of the Bulgarian map, which serves us as a document, proves that the Bulgarian pretentions to supremacy, like those of Pangermanism, aim at absorbing, regardless of language or race, the regions whose possession is deemed useful to Bulgaria. Thus the rapacious doctrine of the Bulgarians is absolutely identical with that of the Prussians. This identity has facilitated the understanding between the two peoples. In fact, the Great Bulgaria of our official document of 1907 (see the map on p. 133) includes the following: the Roumanian Dobrudja as far as Galatz and Sulina, on which clearly the Bulgarians can lay no justifiable claim; the shores of the Ægean Sea; the territory from Serres to Gumuldjina, where the Greek element is dominant; the region of Nisch, which is Serbian; the region of Prizrend, which had been recognized as Serbian by the Bulgarians themselves in their treaty of alliance with the Serbians in 1912. As to the region of Uskub as far as Lake Ochrida, near Albania, the Bulgarians in their treaty with the Serbians admitted it to be disputable. Its allotment was to be referred to the arbitration of the Emperor of Russia, which the Bulgarians never seriously desired, and to which they opposed a solid obstacle by their attack on the Serbians in June, 1913. Lastly, the region south of Uskub, that is, the portion of Macedonia which forms the south of the present Serbia, requires a detailed exposition by itself. This is essential, for concerning Serbian Macedonia many misconceptions have been propagated by the Allied Press and have been the source of the mistakes committed by the Allies in the Balkans in 1915.