With pirate ships they infested the seas, and spread their ravages along the coasts of Spain and Italy, until Charles the Fifth was aroused to undertake their overthrow. The various strength of his broad dominions was rallied in this new crusade. "If the enthusiasm," says Sismondi, "which had armed the Christians in the old Crusades was nearly extinct, a new sentiment, more rational and legitimate, united the vows of Europe with the efforts of Charles against the infidels. The object was no longer to reconquer the tomb of Christ, but to defend the civilization, the liberty, the lives of Christians."[32] A stanch body of infantry from Germany, veterans of Spain and Italy, the flower of the Spanish nobility, knights of Malta, with a fleet of near five hundred vessels, contributed by Italy, Portugal, and even distant Holland, commanded by Andrew Doria, the great sea-officer of the age,--the whole under the immediate eye of the Emperor himself, with the countenance and benediction of the Pope, and composing one of the most complete armaments which the world had hitherto seen,--were directed upon Tunis. Barbarossa opposed them bravely, but with unequal forces. While slowly yielding to attack from without, his defeat was hastened by unexpected uprising within. Confined in the citadel were many Christian slaves, who, asserting the rights of freedom, obtained a bloody emancipation, and turned its artillery against their former masters. The place yielded to the Emperor, whose soldiers soon surrendered to the inhuman excesses of war. The blood of thirty thousand innocent inhabitants reddened his victory. Amidst these scenes of horror there was but one spectacle that afforded any satisfaction to the imperial conqueror. It was that of ten thousand Christian slaves rejoicing in emancipation, who met him as he entered the town, and, falling on their knees, thanked him as their deliverer.[33] [32] Histoire des Français, Tom. XVII. pp. 101, 102. [33] Robertson, History of Charles the Fifth, Book V. In the treaty of peace which ensued, it was expressly stipulated on the part of Tunis, that all Christian slaves, of whatever nation, should be set at liberty without ransom, and that no subject of the Emperor should for the future be detained in slavery.[34] [34] Robertson, History of Charles the Fifth. Book V. The apparent generosity of this undertaking, the magnificence with which it was conducted, and the success with which it was crowned drew to the Emperor the homage of his age beyond any other event of his reign. Twenty thousand slaves freed by treaty or by arms diffused through Europe the praise of his name. It is probable that in this expedition the Emperor was governed by motives little higher than vulgar ambition and fame; but the results by which it was emblazoned, in the emancipation of so many fellow-Christians from cruel chains, place him, with Cardinal Ximenes, among the earliest Abolitionists of modern times.