His Chasseur was considered one of the ablest privateers of the war and the most beautiful vessel ever seen in Baltimore.

A fleet and graceful schooner with a magical turn for speed, she mounted sixteen long twelve-pounders and carried a hundred officers, seamen, and marines, and was never outsailed in fair winds or foul.

"Out of sheer wantonness," said an admirer, "she sometimes affected to chase the enemy's men-of-war of far superior force." Once when surrounded by two frigates and two naval brigs, she slipped through and was gone like a phantom.

During his first cruise in the Chasseur, Captain Boyle captured eighteen valuable merchantmen.

It was such defiant rovers as he that provoked the "Morning Chronicle" of London to splutter "that the whole coast of Ireland from Wexford round by Cape Clear to Carrickfergus, should have been for above a month under the unresisted domination of a few petty fly-by-nights from the blockaded ports of the United States is a grievance equally intolerable and disgraceful." This was when the schooner Syren had captured His Majesty's cutter Landrail while crossing the Irish Sea with dispatches; when the Governor Tompkins burned fourteen English vessels in the English Channel in quick succession; when the Harpy of Baltimore cruised for three months off the Irish and English coasts and in the Bay of Biscay, and returned to Boston filled with spoils, including a half million dollars of money; when the Prince de Neuchatel hovered at her leisure in the Irish Channel and made coasting trade impossible; and when the Young Wasp of Philadelphia cruised for six months in those same waters.
Two of the privateers mentioned were first-class fighting ships whose engagements were as notable, in their way, as those of the American frigates which made the war as illustrious by sea as it was ignominious by land.