It was incumbent upon him, as a consequence, to vindicate this high-handed anticipation of the unqualified Florentine permission which had not arrived. So he declared that he had been offended last year by Florence in the matter of Forli, and again this year in the matter of Faenza, both of which cities he charged the Signory with having assisted to resist him, and he announced that, to justify his intentions so far as Florence was concerned, he would explain himself at Barberino.
There, on May 12, he gave audience to the ambassador. He declared to him that he desired a good understanding with Florence, and that she should offer no hindrance to the conquest of Piombino, upon which he was now bound; adding that since he placed no trust in the present government, which already had broken faith with him, he would require some good security for the treaty to be made. Of reinstating the Medici he said nothing; but he demanded that some satisfaction be given Vitelli and Orsini, and, to quicken Florence in coming to a decision, he pushed forward with his army as far as Forno dei Campi—almost under her very walls.
The Republic was thrown into consternation. Instantly she got together what forces she disposed of, and proceeded to fling her artillery into the Arno, to the end that she should be constrained neither to refuse it to Cesare upon his demand, nor yet to deliver it.
Macchiavelli censures the Signory’s conduct of this affair as impolitic. He contends that the duke, being in great strength of arms, and Florence not armed at all, and therefore in no case to hinder his passage, it would have been wiser and the Signory would better have saved its face and dignity, had it accorded Cesare the permission to pass which he demanded, rather than have been subjected to behold him enforce that passage by weight of arms. But all that now concerned the Florentines was to be rid of an army whose presence in their territory was a constant menace. And to gain that end they were ready to give any undertakings, just as they were resolved to fulfil none.
Similarly, it chanced that Cesare was in no less a hurry to be gone; for he had received another letter from the Pope commanding his withdrawal, and in addition, he was being plagued by Vitelli and Orsini—grown restive—with entreaties for permission to go into either Florence or Pistoja, where they did not lack for friends. To resist them Cesare had need of all the severity and resolution he could command; and he even went so far as to back his refusal by a threat himself to take up arms against them if they insisted.
On the 15th, at last, the treaty—which amounted to an offensive and defensive alliance—was signed. By the terms of this, Florence undertook to give Cesare a condotta of 300 lances for three years, to be used in Florentine service, with a stipend of 36,000 ducats yearly. How much this really meant the duke was to discover two days later, when he sent to ask the Signory to lend him some cannon for the emprise against Piombino, and to pay him the first instalment of one quarter of the yearly stipend before he left Florentine territory. The Signory replied that, by the terms of the agreement, there was no obligation for the immediate payment of the instalment, whilst in the matter of the artillery they put him off from day to day, until Cesare understood that their only aim in signing the treaty had been the immediate one of being rid of his army.
The risk Florence incurred in so playing fast-and-loose with such a man, particularly in a moment of such utter unfitness to resist him, is, notwithstanding the French protection enjoyed by the Signory, amazing in its reckless audacity. It was fortunate for Florence that the Pope’s orders tied the duke’s hands—and it may be that of this the Signory had knowledge, and that it was upon such knowledge, in conjunction with France’s protection, that it was presuming. Cesare took the matter in the spirit of an excellent loser.
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.