The surrender liberated the besieging force for operations elsewhere, and the Russians began a serious effort to surmount the Carpathian rampart. They got well to the south of the Dukla, made substantial progress in the centre through the Rostoki pass, and by the middle of April held the crests for a continuous seventy miles; cavalry penetrated much farther down the slopes, and the Austrians prepared to evacuate the Ungvar valley. Reciprocal raids occurred elsewhere on the Eastern front: the Russians seized and burnt Memel, and the Germans retaliated by the bombardment of Libau. Despite warnings like that of "The Times" Petrograd correspondent on 13 April to the effect that the Germans had not only sent enormous reinforcements to the Carpathians, but had taken charge of the operations, there was general confidence in the West in a coming triumphant Russian offensive. Dmitrieff himself had no suspicion of what was in store until a few days before the storm broke; and a Panslav society in Petrograd passed and published abroad a resolution that in view of the victorious progress of the Russian armies across the Carpathians, the contemplated intervention of Italy in the war was belated and undesirable. The Russian Government cannot have been ignorant of the weakness of Russian armies, not in man-power, still less in skill or courage, but in artillery and equipment; but it had no conception of the material and mechanical force which Germany was prepared to bring to the urgent task of relieving the pressure on her ally. Nor was it for nothing that Turkey had been cajoled and bribed into making war. Turkish generalship and organization were negligible quantities, but Germany could supply those defects, and Turkish bravery and man-power could be used as a valuable means of distracting Russia's attention and diverting forces from the Polish and Galician fronts. This had been the main purpose of the campaign in the Caucasus which Turkey waged in the winter. They began by seizing Tabriz in the province of Azerbaijan, which though nominally Persian had been for some time occupied partly by Russian and partly by Turkish troops; but the Russians were first across the Russo-Turkish frontier and captured Bayazid, Khorasan, and Kuprikeui. These advance-guards were, however, pushed back by the Turks, whose leader and evil genius, the half-Polish and German-educated adventurer, Enver, had conceived an ambitious design of encircling the Russian armies between Sarikamysh and Ardahan. In December the Turks succeeded in making their arduous way across the snow-clad mountains, and on 1 January they were in Ardahan. But the task would have tried the German Army itself in summer, and Enver had attempted more than he could achieve. His army corps were successively isolated and defeated in a series of engagements collectively known as the battle of Sarikamysh, and driven back across the frontier with heavy losses. Tabriz was reoccupied by