One fortunate circumstance for Christendom is, that at the period when the crusades, which had for their object the defence of Europe, drew near to their end, the Turks began to lose some part of that military power which they had displayed in their contests with the Christian nations. The Ottomans had at first been, as we have already said, the only nation that kept on foot a regular standing army, which gave it a vast superiority over powers that it was desirous of subduing. In the sixteenth century, most of the great states of Europe had likewise armies which they could at any time bring against their enemies. Discipline and military tactics had made great progress in Christendom; artillery and marine became more perfect in the West every day, whilst the Turks, in all that concerns the art of war, or that of navigation, gathered no advantage from either the lessons of experience, or from the knowledge to which time and circumstances had given birth among their neighbours. We ought to add, that the spirit of superstition and intolerance which the Turks associated with their wars, was very injurious to the preservation and extent of their conquests. When they took possession of a province, they insisted upon making their laws, their customs, and their worship paramount. They must change everything, they must destroy everything, in the country in which they wished to establish themselves; they must either exterminate the population, or reduce it to the impossibility of disturbing a foreign domination. Thus it may be remarked, that, although several times masters of Hungary, they retired from it after every campaign, and were never able, amidst all their victories, to found a colony or make any durable establishment there. The Ottoman population which had sufficed for occupying and enslaving the Greek empire, could not people and preserve more distant countries. It was this, above everything, which saved Germany and Italy from the invasion of the Turks. The Ottomans might, perhaps, have conquered the world if they had been able to impose their manners upon it, or furnish it with inhabitants.
After the battle of Lepanto, although they had preserved the isle of Cyprus, and dictated laws to the republic of Venice, the Turks not the less lost the idea of their being invincible, or that all the world must submit to their arms. It was observed that from that time most of the leaders of Turkish armies or fleets became more timid, and felt less assured of victory, when in the presence of an enemy. Astrologers, who had till then beheld in the phenomena of the heavens the increase and the glory of the Ottoman empire, saw nothing during the reign of Soliman and following reigns but sinister auguries in the aspects of the celestial bodies. We mention astrologers, because their predictions have considerable influence upon the policy of the Turks. It is not improbable that these pretended conjurers did not confine their observations to the celestial bodies, but that they watched the manners and the opinions of the people, and the march of events and affairs. It is for this reason that their prophecies were found true, and that they belong, in some sort, to history.
The spirit of conquest, however, which had so long animated the nation, still subsisted, and sometimes fortune favoured the Ottoman banner with victory.
Towards the end of the sixteenth century, the Turks carried war to both the banks of the Danube and to the frontiers of Persia. Among the Christian warriors who flew to the aid of Germany, the duke of Mercœur, brother of the duke of Mayenne, must not be forgotten; he was followed by a crowd of French soldiers, who had fought against Henry IV., and who went to expiate the crimes of civil war by fighting the infidels. The duke of Mercœur, to whom the emperor Rodolph II. gave the command of the imperial army, gained several advantages over the Ottomans.
Whilst the war was being carried on in Hungary, the king of Persia sent an embassy to the emperor of Germany and the princes of the West, to persuade them to form an alliance with him against the Turks. The Persian ambassadors repaired to the court of the sovereign pontiff, and to those of several Christian powers, conjuring them to declare war against the Ottomans. This embassy of the king of Persia, and the exploits of the French on the Danube, created great uneasiness in the Divan, and an ambassador was sent to the king of France, as the most to be feared of the Christian princes. The letters of credit of the Turkish envoy bore this title: “To the most glorious, magnanimous, and greatest lord of the faith of Jesus, pacificator of the differences which arise among Christian princes, lord of greatness, majesty, and riches, and glorious guide of the greatest, Henry IV., emperor of France.” The sultan of the Turks conjured the French monarch, in his letter, to bring about a truce between the Porte and the emperor of Germany, and to recall from Hungary the duke of Mercœur, whose valour and skill brought victory to the banners of the Germans. Henry IV. interrogated the Ottoman ambassador, and asked him why the Turks dreaded the duke of Mercœur so much. The ambassador replied, that a prophecy, credited by the Turks, declared that the sword of the French would drive them from Europe, and overthrow their empire. Henry IV. did not recall the duke of Mercœur: this able captain continued to beat the Ottomans, and having covered himself with glory in the war against the infidels, he was seized, whilst on his return to France, by a purple fever, “which,” says Mezerai, “sent him to triumph in heaven.”
In their wars against the Christians, the Turks often found themselves on the defensive, which was for them a sign of decline. History remarks that at no period did their reverses cause them more alarm, or their victories more surprise and joy. Their defeats were almost always a signal for sedition and revolt, which the decline of power rendered bold.
And yet the Ottoman empire still carried on war, and advanced like a storm ready to burst. In the middle of the seventeenth century, the isle of Chio, which had belonged to the Genoese, was added to its maritime possessions, and the Turks directed their victorious arms towards Candia, an important colony of the Venetians. At the same time an Ottoman army entered Transylvania, and greatly alarmed Austria.
Pope Alexander VII., pressed by the emperor Leopold I. and by the Venetian senate, endeavoured to form a league among the princes and states of Christendom, and addressed the king of Poland, the king of Spain, and more particularly the king of France, to implore their succour against the Turks.
Louis XIV. yielded to the prayers of the sovereign pontiff, and sent to Rome an ambassador charged to announce to his holiness, that he entered into the confederation of the Christian princes. On the other side, the states of the Germanic empire, which were the allies of France, assembled at Frankfort, and engaged to raise money and troops, promising to unite their efforts with those of the French monarch, for the defence of Christendom.