Another important event was the repudiation by Russia on October 31, 1870, during the Franco-German War, of the clause in the treaty of Paris of 1856 which interdicted the Black Sea to Russian and Turkish vessels of war, and forbade to both Powers the creation or maintenance of naval arsenals on the coasts of that sea. We now know that Prince Bismarck, on behalf of Prussia, secured the neutrality of Russia in the war with France, in 1870, by promising to support this repudiation by the Czar of his treaty obligation. Complaint has not unfrequently been made of the refusal or neglect of the British Government, of which Mr. Gladstone was then the head, to insist on the maintenance of this treaty by Russia, even at the risk of war. But the Porte, in whose interest the provision had been framed by the Congress of Paris, and which was primarily concerned in its maintenance, showed no desire or intention to make its breach by Russia a _casus belli_, and it would have been sheer madness for England, either with or without Turkey, to have taken up the challenge of the Czar. A humiliating restriction such as this on the sovereign rights of a great country was obviously of a temporary character, and could not, in the nature of things, be a permanent arrangement. It had served its purpose by giving to the Porte a respite of fourteen years from naval attack by Russia. Lord Palmerston, who was Prime Minister in England when the treaty was made, had himself put on record the opinion that the enforced neutrality of the Black Sea might be expected to last for fifteen years. It is to be noted that some years would necessarily elapse after the repudiation of the treaty before a Russian fleet could be created in the Black Sea and before Sebastopol could be restored as a naval base. In point of fact, in the war, which was soon to break out between Russia and Turkey, in 1877, the latter Power had virtual command of the Black Sea, and the Russian army which crossed the Balkans and advanced to the vicinity of Constantinople did so without the support of a naval force in the Black Sea, as had been the case in 1829.