The successes of the republic at sea and in their distant enterprises were continual, and in some instances brilliant. Brazil was gradually falling into the power of the West India Company. The East India possessions were secure. The great victory of Van Tromp, known by the name of the battle of the Downs, from being fought off the coast of England, on the 21st of October, 1639, raised the naval reputation of Holland as high as it could well be carried. Fifty ships taken, burned, and sunk, were the proofs of their admiral's triumph; and the Spanish navy never recovered the loss. The victory was celebrated throughout Europe, and Van Tromp was the hero of the day. The king of England was, however, highly indignant at the hardihood with which the Dutch admiral broke through the etiquette of territorial respect, and destroyed his country's bitter foes under the very sanction of English neutrality. But the subjects of Charles I. did not partake their monarch's feelings. They had no sympathy with arbitrary and tyrannic government; and their joy at the misfortune of their old enemies the Spaniards gave a fair warning of the spirit which afterward proved so fatal to the infatuated king, who on this occasion would have protected and aided them. In an unsuccessful enterprise in Flanders, Count Henry Casimir of Nassau was mortally wounded, adding another to the list of those of that illustrious family whose lives were lost in the service of their country. His brother, Count William Frederick, succeeded him in his office of stadtholder of Friesland; but the same dignity in the provinces of Groningen and Drent devolved on the Prince of Orange. The latter had conceived the desire of a royal alliance for his son William. Charles I. readily assented to the proposal of the states-general that this young prince should receive the hand of his daughter Mary. Embassies were exchanged; the conditions of the contract agreed on; but it was not till two years later that Van Tromp, with an escort of twenty ships, conducted the princess, then twelve years old, to the country of her future husband. The republic did not view with an eye quite favorable this advancing aggrandizement of the House of Orange. Frederick Henry had shortly before been dignified by the king of France, at the suggestion of Richelieu, with the title of "highness," instead of the inferior one of "excellency"; and the states-general, jealous of this distinction granted to their chief magistrate, adopted for themselves the sounding appellation of "high and mighty lords." The Prince of Orange, whatever might have been his private views of ambition, had however the prudence to silence all suspicion, by the mild and moderate use which he made of the power, which he might perhaps have wished to increase, but never attempted to abuse.