So numerically strong, and so complete, were the preparations for war made by the Bosnians, that, when they took the field under Ali Kieditch, Tahir found it impossible to stem the torrent of rebellion. Never did the prospects of the Porte wear so gloomy an aspect, for there were ranged against it all classes of Slaves and Bulgares, irrespective of religion or denomination. As a last resource government convened a Congress, comprising representatives of all classes of subject Slaves. As might have been supposed, little unanimity prevailed in their counsels, and no tangible advantages were thereby attained. And now a combination of unforeseen circumstances conspired to rescue the Porte from the pressing danger which threatened it. The neutrality preserved by Servia, or rather its Prince, Alexander Guirgievitch, infected not only the Bulgarian Christians, but even the Montenegrins themselves, who actually overran Herzegovina and a portion of the Bosnian frontier during the absence of the Mussulman Spahis of those districts. Undaunted however, by these mishaps, the members of the Congress returned to their homes; and, although powerless to act in concert, succeeded so well in stirring up a feeling of animosity against the government, that the spring of 1850 found the malcontents in a better position than ever for the renewal of the war. But rebellion had now reached its culminating point, and the sudden appearance of Omer Pacha, who threw himself with impetuous daring into the heart of Bosnia, gave a very different colouring to events. To form a just estimate of the difficulties which he had to overcome, ere order could be re-established in this confused chaos, it is necessary briefly to recapitulate the various conflicting elements, revolutionary and otherwise, which had been brought into play, the aim and inevitable result of which must have been the utter destruction of this unhappy empire.