Meanwhile revolutionary outbreaks began to increase, but were always put down with great rigour. The most notable was that of 1875, instigated by Stambulóv, the future dictator, in sympathy with the outbreak in Montenegro, Hercegovina, and Bosnia of that year; the result of this and of similar movements in 1876 was the series of notorious Bulgarian massacres in that year. The indignation of Europe was aroused and concerted representations were urgently made at Constantinople. Midhat Pasha disarmed his opponents by summarily introducing the British constitution into Turkey, but, needless to say, Bulgaria’s lot was not improved by this specious device. Russia had, however, steadily been making her preparations, and, Turkey having refused to discontinue hostilities against Montenegro, on April 24, 1877, war was declared by the Emperor Alexander II, whose patience had become exhausted; he was joined by Prince Charles of Rumania, who saw that by doing so he would be rewarded by the complete emancipation of his country, then still a vassal-state of Turkey, and its erection into a kingdom. At the beginning of the war all went well for the Russians and Rumanians, who were soon joined by large numbers of Bulgarian insurgents; the Turkish forces were scattered all over the peninsula. The committee of Bucarest transformed itself into a provisional government, but the Russians, who had undertaken to liberate the country, naturally had to keep its administration temporarily in their own hands, and refused their recognition. The Turks, alarmed at the early victories of the Russians, brought up better generals and troops, and defeated the Russians at Plevna in July. They failed, however, to dislodge them from the important and famous Shipka Pass in August, and after this they became demoralized and their resistance rapidly weakened. The Russians, helped by the Bulgarians and Rumanians, fought throughout the summer with the greatest gallantry; they took Plevna, after a three months’ siege, in December, occupied Sofia and Philippopolis in January 1878, and pushed forward to the walls of Constantinople. The Turks were at their last gasp, and at Adrianople, in March 1878, Ignatiyev dictated the terms of the Treaty of San Stefano, by which a principality of Bulgaria, under the nominal suzerainty of the Sultan, was created, stretching from the Danube to the Aegean, and from the Black Sea to Albania, including all Macedonia and leaving to the Turks only the district between Constantinople and Adrianople, Chalcidice, and the town of Salonika; Bulgaria would thus have regained the dimensions it possessed under Tsar Simeon nine hundred and fifty years previously.