On March 18, 1912, a treaty was signed between Bulgaria and Serbia for mutual military aid to one another in war with Turkey. A secret clause provided that in the event of any portion of Macedonia being conquered the parts respectively nearest to the two States should be annexed to them, and that the intervening territory should be divided between them by the arbitration of Russia. This clearly showed that the intervention aimed at territorial conquest. Two months later another treaty was signed between Greece and Bulgaria, binding the two States to aid one another if attacked by Turkey, or in the event of systematic violation of rights by that Power. Nothing was said in this as to the division of spoil after the war. Montenegro later came into the chain of alliances, and, in fact, was always eager for war with Turkey.

When it became known to the Great Powers that these alliances were formed, and that war was imminent, they made every effort to allay the storm and to maintain peace. A strong protest was addressed, on September 25th, by Russia and Austria on behalf of all the Powers. They endeavoured to resuscitate the treaty of Berlin, which had so signally failed, to secure order and good government in the remaining Christian provinces of Turkey. They undertook, by virtue of the twenty-third article of that treaty, to insist on the realization of the promised reforms in the administration of these provinces, but with the reservation, which made the promise futile in the eyes of all concerned, that the reforms should not in any way diminish the sovereignty of the Sultan or impair the integrity of the Ottoman Empire.

The allied Balkan States, in a very dignified despatch of October 15th, declined to act on the advice of the Powers.

The Governments of the Balkan States [they said] consider that after so many promises of reform have been so often and so solemnly given by Turkey, it would be cruel not to endeavour to obtain in favour of the Christian population of the Ottoman Empire reforms of a more radical and definite nature which would really ameliorate their miserable condition if applied sincerely and in their integrity.

They enclosed a copy of an ultimatum which, on the same day, they addressed to the Porte, insisting on the carrying out of a series of reforms specially detailed.

If [they said] the Porte desires to accept these proposals, order and tranquillity will be reinstated in the provinces of the Empire, and a desirable peace will be assured between Turkey and the Balkan States, which have hitherto suffered from the arbitrary and provocative measures adopted by the Porte to them.

Among the list of reforms insisted on was the ceding and confirmation of the ethnical autonomy of provinces of the Empire, with all its consequences. The ultimatum was presented to the Porte, which treated it as a declaration of war. Its first and most important act was to come to terms with Italy in order to free its hands for the more important war at its very portals. A treaty of peace was signed on October 15th, by which the Porte agreed to withdraw its troops from Tripoli, and thus virtually recognized the acquisition of that province by Italy. Italy, on the other hand, agreed to withdraw from the islands of the Ægean Sea which it had occupied—a promise which, in fact, it did not perform.

Meanwhile hostilities had already commenced in the Balkans. Montenegro declared war on October 8th. The three other States followed suit on October 18th, and each of them sent its army on the same day, or nearly so, across its frontiers to invade Turkey. Beyond the desire for the better government of the Christian provinces of Turkey, there were doubtless arrières pensées on the part of all the allied States. Greece coveted Crete and other islands in the Ægean Sea, and hoped to extend its frontiers on the mainland. Bulgaria yearned for the big Bulgaria as defined by the treaty of San Stefano. Serbia had ambitions for a revival of its wide boundaries under Stephen Dushan, and aimed at access both to the Ægean Sea and the Adriatic. Montenegro wished for a part of Albania and for extensions in the Adriatic. Each State had large populations of a kindred race beyond its frontier suffering from cruel misgovernment and tyranny and crying for help. But it seems improbable that they could have expected to realize their full hopes, or to achieve such a dénouement as actually occurred.

The allies between them had seven hundred thousand men under arms. Turkey had no more than four hundred thousand in Europe. It had, however, great reserves in Asia, and its aggregate force largely exceeded that of the allies. It was to be expected that the Turkish armies in Europe would make a good fight, and would at least afford time for these reserves to come up.

The Greek army, under the command of the Crown Prince Constantine (the present King of Greece), who had received a military education in Germany, crossed the northern frontier and, in four days, on October 22nd, encountered a Turkish army, under Hassan Pasha, at Sarandoporus. The Turks held a very strong position and were little inferior in numbers. In spite of this, they were worsted, and were compelled to retreat in the following night. The next day the Greeks renewed their attack. The unfortunate Turks, disheartened by their defeat at Sarandoporus and wearied by the long night march, were caught unawares in a ravine which offered no possibility of defence. Terror-stricken and demoralized, they fled before their foe. They left behind them the whole of their artillery and transport.