After the battle of Navarino, on the 20th of October, 1827, where the allied forces destroyed the Turkish fleet. England withdrew, suspicious of Nicholas' schemes; but France and Russia continued the war until by the Peace of Adrianople, the sultan recognized the independence of Greece,—and ceded to Russia four fortresses in Asia and the islands in the delta of the Danube. Russia was thus in possession of the whole southern slope of the Caucasus, besides holding part of its northern front. The czar began war upon the tribes dwelling in the mountains, but found that he had engaged in a very difficult enterprise. A soldier-priest named Schamyl defied the power of Russia for a quarter of a century. It cost Nicholas more in men and money to subdue the liberty-loving mountaineer, than all the wars he waged in Asia.
The year 1830, was one of great unrest in Europe. Nicholas was deeply angered when his friend Charles X of France was expelled. The revolution in Paris was the signal for a similar movement in the capital of Poland. Owing to the independent expression of opinion in the Diet, Alexander had adjourned that body indefinitely in 1822. At the same time the liberty of the press was revoked and the police assumed a power in defiance of the law. The Grand Duke Constantine was really a friend of Poland, but he was eccentric and impetuous and often unconsciously gave offense. In 1830, Nicholas came to Warsaw to open the Diet, when its members made demands which he could not grant. Both sides were angry when Nicholas returned to St. Petersburg.
As soon as the French tricolor was raised above the consulate at Warsaw, the trouble commenced. Taken unprepared, Constantine withdrew with his troops. Again the Poles were divided; the patriots advised reconciliation with Russia, while hotheads demanded the abdication of the Romanofs. The first party sent a deputation to St. Petersburg and another to Paris and London, to secure mediation. The czar's answer was decisive; he absolutely refused to "make concessions (to the revolutionists), as the price of their crimes." Again, too, there was discord among the leaders as they entered upon a life or death struggle. Poland appealed to Europe. The people were sympathetic, but the governments, rejoicing at seeing a revolutionary movement suppressed, refused to interfere.
In February, 1831, a Russian army of 130,000 men invaded Poland. The Poles showed a heroism which appealed to the people of Europe, but more than sympathy was needed to arrest the irresistible Russian advance upon Warsaw. Constantine and the Russian commander-in-chief fell the victims of cholera, but an epidemic of discord struck Poland and sealed its fate. On the 6th of September, Warsaw was invested. The capital was forced to surrender. "Warsaw is at your feet," wrote the commander-in-chief to the czar, who lost no time in trampling upon the conquered. The constitution was abrogated, the Diet, a thing of the past. Poland was no more. Where it had stood, was a Russian province. Russian officials introduced Russian taxes, Russian coinage, and Russian justice such as it was. The Poles saw samples of it when thousands were arrested without process of law, and were sent to prison or to Siberia, while other thousands lost their property by confiscation. In White Russia and Lithuania the use of the Polish language was prohibited and the Catholic Clergy were forced to "ask" admittance to the bosom of the Greek Church. It must be admitted that the Polish peasants benefited by the change. With a view of reducing the influence of the nobles, the government issued regulations protecting the laborer against the landowner.
The Polish revolution caused the reorganization of European policies. Austria and Prussia, each in possession of territory that formerly belonged to Poland, entered into friendly relations with Russia, whereas England and France, where public opinion could not be ignored, drew more closely together. Nicholas was posing as the arbiter of Europe and the champion of kings. He assumed the right to command, but would soon find his will contested.
This was brought home to him in 1832, when trouble broke out between Turkey and Egypt. The Egyptian army was victorious and threatened Constantinople, when the sultan appealed to the powers. Russia responded at once by sending two armies, but a strong protest from England and France caused the withdrawal of the troops of Russia as well as those of Egypt. Baffled, Nicholas on June 3, 1833, entered into an offensive-defensive alliance with the sultan, which really placed Turkey and with it Constantinople in Russia's power. Another sharp protest from England and France prevented the consummation of the alliance.
In 1839 the trouble between Turkey and Egypt recommenced when Great Britain, anxious to preserve Turkey's integrity, entered into an agreement with Russia, Austria and Prussia, which was signed at London in July, 1840. There was some danger of a war with France but England, fearing Russia's designs, returned to her former ally. By the Convention of July 13, 1841, Russia's designs upon old Czargrad were postponed until a more favorable opportunity. In 1844, Nicholas visited England, but his reception in London was cool. He, however, entered into an agreement whereby the Khanates of Central Asia should remain neutral ground between Russia and India.
In 1846, trouble broke out in Gallicia, where the Poles rose against Austria; but as the nobles had to subdue a revolt of their own peasants, order was quickly restored. The free city Cracow was the resort of the Poles. Russia, Austria, and Prussia sent troops against it, and Cracow was annexed by Austria notwithstanding a protest from England and France.
The year 1848 will long be remembered for the blows bestowed upon the divine right of kings, and the privileges which the sovereigns were compelled to concede to the people. The Emperor Ferdinand of Austria was expelled from his capital, and the King of Prussia was subjected to humiliation by his own people. France proclaimed the republic, and Nicholas proclaimed himself the champion of the right divine. He dispatched an army into Hungary, which was soon "at the feet of your Majesty," and felt the wrath of the frightened Ferdinand.
Notwithstanding this cooperation, the understanding among the three powers, Russia, Austria and Prussia, was giving way before individual interests. When, in 1852, Prussia attempted to seize the German provinces of Denmark, it was Nicholas who compelled her to withdraw. On the 8th of May of that year, the independence and integrity of Denmark were recognized by the Treaty of London.