Not a hint of his chagrin and resentment did he betray; instead, he set about furnishing his needs elsewhere, sending Vitelli to Pisa with a request for artillery, a request to which Pisa very readily responded, as much on Vitelli’s account as on the duke’s. As for Florence, if Cesare Borgia could be terribly swift in punishing, he could also be formidably slow. If he could strike upon the instant where the opening for a blow appeared, he could also wait for months until the opening should be found. He waited now. It would be at about this time that young Loenardo da Vinci sought employment in Cesare Borgia’s service. Leonardo had been in Milan until the summer of 1500, when he repaired to Florence in quest of better fortune; but, finding little or no work to engage him there, he took the chance of the duke of Valentinois’s passage to offer his service to one whose liberal patronage of the arts was become proverbial. Cesare took him into his employ as engineer and architect, leaving him in the Romagna for the present. Leonardo may have superintended the repairs of the Castle of Forli, whilst he certainly built the canal from Cesena to the Porto Cesenatico, before rejoining the duke in Rome. On May 25 Cesare moved by the way of the valley of Cecina to try conclusions with Giacomo d’Appiano, Tyrant of Piombino, who with some Genoese and some Florentine aid, was disposed to offer resistance to the duke. The first strategic movement in this affair must be the capture of the Isle of Elba, whence aid might reach Piombino on its promontory thrusting out into the sea. For this purpose the Pope sent from Civita Vecchia six galleys, three brigantines, and two galleons under the command of Lodovico Mosca, captain of the papal navy, whilst Cesare was further reinforced by some vessels sent him from Pisa together with eight pieces of cannon. With these he made an easy capture of Elba and Pianosa. That done, he proceeded to lay siege to Piombino, which, after making a gallant resistance enduring for two months, was finally pressed to capitulate. Long before that happened, however, Cesare had taken his departure. Being awaited in Rome, he was unable to conduct the siege operations in person. So he quitted Piombino in June to join the French under d’Aubigny, bound at last upon the conquest of Naples, and claiming--as their treaty with him provided--Cesare’s collaboration. CHAPTER X. THE END OF THE HOUSE OF ARAGON Cesare arrived in Rome on June 13. There was none of the usual pomp on this occasion. He made his entrance quietly, attended only by a small body of men-at-arms, and he was followed, on the morrow, by Yves d’Allègre with the army--considerably reduced by the detachments which had been left to garrison the Romagna, and to lay siege to Piombino.