Meanwhile a danger threatened the Serbians which overshadowed even that from the Austrians; namely the danger that other Balkan nations, and especially Bulgaria, might join the Teutonic Powers. Serbia had already shown that she could take care of the Austrians alone, but with Bulgaria attacking her flank, even the most optimistic realized that the fight against such odds probably would be hopeless. Turkey, even while Serbia was hurling back the Austrians for the second time, in November, 1914, was the first to declare herself in favor of the Teutons by attacking the Russians. Then began the game of diplomacy to win over the Christian states to the Allies. All had declared themselves neutral, even Greece, though she was bound by a treaty to assist Serbia against foreign attack. But it was generally realized that each was only watching for the first signs of weakness on either side before deciding which to support. To give weight to her diplomacy Great Britain began her military operations on Gallipoli, on the understanding with Greece, of which Venizelos was then premier, that Greek troops should assist. But Venizelos was forced to resign by the Greek King and the governing clique, and Greece continued to maintain her neutrality. Rumania, in spite of her leanings toward the Allies, remained firm in her neutrality. Bulgaria was more explicit; she made it understood that she would join that side which could most effectually guarantee her possession of the territory in Macedonia which she considered she had won in the First Balkan War and which was given over to Serbia and Greece after the Second Balkan War by the Treaty of Bucharest. Throughout the year the negotiations continued whereby the Allies attempted to persuade Greece and Serbia to agree to Bulgaria's terms, but Greece continued obdurate in her determination to hold all she had, and Serbia yielded only in part, and very reluctantly. In August, 1915, beginning the second year of the war, these negotiations were still in progress. As it was still unknown publicly that Bulgaria had already signed a secret alliance with Germany, the situation was considered favorable to the Allies, especially as on August 22, 1915, it was announced that Venizelos was again to become prime minister of Greece. The first indication that King Ferdinand and his cabinet had come to a decision was in the agitation that appeared in Bulgaria itself among the leaders of the opposition parties, protesting against the Germanophile policy of the Government. On September 18, 1915, a deputation of these leaders had an interview with the king, in which they made their protest; the report was that a stormy scene occurred, in which several members of the deputation used language to the effect that should the king go against the popular feeling, which was in favor of the Entente, it would cost him his throne. They also demanded that the National Assembly be convened.