To show the Siennese how much he was in earnest, he leaves all baggage and stores at Assisi, and, unhampered, makes one of his sudden swoops towards Siena, pausing on January 13 at Castel della Pieve to publish, at last, his treaty with Bentivogli.

The latter being now sincere, no doubt out of fear of the consequences of further insincerity, at once sends Cesare 30 lances and 100 arbalisters under the command of Antonio della Volta.
It was there in Assisi, on the morning of striking his camp again, that Cesare completed the work that had been begun at Sinigaglia by having Paolo Orsini and the Duke of Gravina strangled.

There was no cause to delay the matter longer.

He had word from Rome of the capture of Cardinal Orsini, of Gianbattista da Virginio, of Giacomo di Santacroce, and Rinaldo Orsini, Archbishop of Florence.
On January 27, Pandolfo Petrucci being still in Siena, and Cesare's patience exhausted, he issued an ultimatum from his camp at Sartiano in which he declared that if, within twenty-four hours, Petrucci had not been expelled from the city, he would loose his soldiers upon Siena to devastate the territory, and would treat every inhabitant "as a Pandolfo and an enemy." Siena judged it well to bow before that threatening command, and Cesare, seeing himself obeyed, was free to depart to Rome, whither the Pope had recalled him and where work awaited him.

He was required to make an end of the resistance of the barons, a task which had been entrusted to his brother Giuffredo, but which the latter had been unable to carry out.
In this matter Cesare and his father are said to have violently disagreed, and it is reported that high words flew between them; for Cesare--who looked ahead and had his own future to consider, which should extend beyond the lifetime of Alexander VI--would not move against Silvio Savelli in Palombara, nor Gian Giordano in Bracciano, alleging, as his reason for the latter forbearance, that Gian Giordano, being a knight of St.Michael like himself, he was inhibited by the terms of that knighthood from levying war upon him.