The execution of sentence on Raleigh was deferred, and he was committed to the Tower, where he remained as a State prisoner for the next thirteen years, engaged in philosophic and scientific pursuits and the education of Prince Henry, the then Prince of Wales. All this time, however, he remained a person of considerable political importance, owing to the assistance which the opponents of the proposed marriage between Prince Charles and the Spanish Infanta hoped to derive from his general popularity, and his reputation as the leading representative of English hatred of Spain. At last, in 1616, he was released from custody, though he was still technically a condemned man, and allowed to prepare his expedition in search of the gold-mine which he believed to exist in Guiana, on the banks of the Orinoco. The expedition was in fact promoted by Winwood, then Secretary, and Villiers, who was at the moment in the hands of the enemies of Somerset and the Spanish faction, and was always intended by them as an act of hostility to Spain. How far Raleigh entered into it in the spirit in which he represented it to the King, may be judged of from the fact that he was ready at one time to direct it against the Spaniards in Genoa, as a relief to the Duke of Savoy, with whom they were then at war, and at another against the French, to support a rebellion against the Queen-Mother, then in power. He had also entered into negotiations with the French Court to bring his ships back to France rather than England when its end was accomplished. What Raleigh's actual intentions were when he started, it is impossible to say. But they were all frustrated when a force which he sent up the Orinoco was disastrously defeated in January 1617, in an attack on a Spanish settlement, which was unexpectedly discovered between the sea and the supposed situation of the mine. Raleigh returned a ruined man. He wished himself to go to France, but his crew forced him to promise to obtain their pardon from the King before he brought his ship into port. In the end, after having touched at Kinsale, he persuaded his men to sail for Plymouth. On landing he set out for London, but on the way met his cousin, Sir Lewis Stukely, Vice-Admiral of Devon, charged with orders to arrest him. Returning to Plymouth, he found means to put himself into communication with the captain of a French ship, lying in the Sound. Preparations were made for his escape in her, but Raleigh changed his mind when he was actually in a boat on his way to board her, and returned to land. Soon after orders came that he should be brought up to London; but he managed to procure a little more time by feigning illness at Salisbury. Here he attempted to bribe Stukely to allow him to escape; but this proving in vain, he sent King, one of his captains, to hire a vessel at Gravesend to await him till he could go on board. The master, however, communicated the plan to a captain of one of the King's