He felt, no doubt, that a man of such resource, energy, and daring, was too dangerous a piece of property to be left in private hands; and he had him heavily ironed and lodged in his own prison.

If he thought that by these means he could break the spirit or shake the resolution of his prisoner, he was soon undeceived, for Cervantes contrived before long to despatch a letter to the Governor of Oran, entreating him to send him some one that could be trusted, to enable him and three other gentlemen, fellow-captives of his, to make their escape; intending evidently to renew his first attempt with a more trustworthy guide.

Unfortunately the Moor who carried the letter was stopped just outside Oran, and the letter being found upon him, he was sent back to Algiers, where by the order of the Dey he was promptly impaled as a warning to others, while Cervantes was condemned to receive two thousand blows of the stick, a number which most likely would have deprived the world of "Don Quixote," had not some persons, who they were we know not, interceded on his behalf.
After this he seems to have been kept in still closer confinement than before, for nearly two years passed before he made another attempt.

This time his plan was to purchase, by the aid of a Spanish renegade and two Valencian merchants resident in Algiers, an armed vessel in which he and about sixty of the leading captives were to make their escape; but just as they were about to put it into execution one Doctor Juan Blanco de Paz, an ecclesiastic and a compatriot, informed the Dey of the plot.
Cervantes by force of character, by his self-devotion, by his untiring energy and his exertions to lighten the lot of his companions in misery, had endeared himself to all, and become the leading spirit in the captive colony, and, incredible as it may seem, jealousy of his influence and the esteem in which he was held, moved this man to compass his destruction by a cruel death.

The merchants finding that the Dey knew all, and fearing that Cervantes under torture might make disclosures that would imperil their own lives, tried to persuade him to slip away on board a vessel that was on the point of sailing for Spain; but he told them they had nothing to fear, for no tortures would make him compromise anybody, and he went at once and gave himself up to the Dey.
As before, the Dey tried to force him to name his accomplices.