On June 28, 1914, the Archduke Francis Ferdinand, the heir to the Austrian throne, was murdered, along with his wife, in the little Bosnian town of Serajevo. Austria had long been jealous of the movement towards unity among the Slav peoples in the Balkans, with Serbia at their head, and she believed, or pretended to believe, that the murder had been connived at by the Serbian Government. Germany, for reasons of her own, was equally desirous to see the power of the Balkan states diminished. She had a grandiose design of extending her influence eastward through Constantinople to the Persian Gulf, with Turkey as her ally or her tool, and planting a German outpost on the flank of our Indian Empire; and a strong Serbian kingdom, or a union of Slav peoples, would effectually bar the way. With the approval of Germany, therefore, Austria sent an ultimatum to Serbia, demanding certain concessions which would have made Serbia no longer a sovereign state. Serbia, while willing to grant most of the demands, was compelled to refuse others, and Austria promptly declared war. Russia now interfered in support of Serbia, and mobilized her armies on her southern frontiers. Every attempt was made by the statesmen of Western Europe, and notably by the British Foreign Secretary, Sir Edward Grey, to limit the quarrel and to persuade Austria to listen to reason. Germany, however, had no desire for a peaceful settlement. She induced Austria to refuse all mediation, and presently, after a peremptory request to the Tsar to demobilize, she declared war upon Russia. Russia and France were allies, and war with France followed naturally within twenty-four hours. The position of Britain had become extremely difficult She had no formal alliance with France, but in her own interests she could not allow her nearest neighbour to be crushed, and the balance of power in Europe to be entirely changed. Britain had never seriously considered the possibility of a European war, and was extremely averse from interfering in a quarrel in which she had no direct concern. She might well have hesitated till it was too late to act with effect, or have blundered into some foolish compromise with Germany. The situation was saved by Belgium. The German scheme of attack on France was based upon a sudden invasion from the north, and for this a march through Belgium was essential. The neutrality of Belgium had long before been guaranteed by all the great Powers, but Germany argued that her necessity must override the law of nations, and demanded a passage through Belgium. This was refused. The invasion of Belgium accordingly began on Sunday, the 2nd August, and this outrage determined the policy of the British Government and the British people.