Fate--in the shape of his cousin Lodovico of Milan--postponed the occasion.
On the 26th Cesare lay at Montefiori, and there he was reached by couriers sent at all speed from Milan by Trivulzio.

Lodovico Sforza had raised an army of Swiss and German mercenaries to reconquer his dominions, and the Milanese were opening their arms to receive him back, having already discovered that, in exchanging his rule for that of the French, they had but exchanged King Log for King Stork.

Trivulzio begged for the instant return of the French troops serving under Cesare, and Cesare, naturally compelled to accede, was forced to postpone the continuance of his campaign, a matter which must have been not a little vexatious at such a moment.
He returned to Cesena, where, on the 27th, he dismissed Yves d'Allegre and his men, who made all haste back to Milan, so that Cesare was left with a force of not more than a thousand foot and five hundred horse.
These, no doubt, would have sufficed him for the conquest of Pesaro, but Giovanni Sforza, encouraged by his cousin's return, and hopeful now of assistance, would certainly entrench himself and submit to a siege which must of necessity be long-drawn, since the departure of the French had deprived Cesare of his artillery.
Therefore the duke disposed matters for his return to Rome instead, and, leaving Ercole Bentivogli with five hundred horse and Gonsalvo de Mirafuente with three hundred foot to garrison Forli, he left Cesena with the remainder of his forces, including Vitelli's horse, on January 30.

With him went Caterina Sforza-Riario, and of course there were not wanting those who alleged that, during the few days at Cesena he had carried his conquest of her further than the matter of her territories( 1)--a rumour whose parent was, no doubt, the ribald jest made in Milan by Trivulzio when he heard of her capture.
1 "Teneva detta Madona (la qual e belissima dona, fiola del Ducha Galeazo di Milan) di zorno e di note in la sna camera, con la quale--judicio omnium--si deva piacer" (Sanuto's Diarii).
He conducted her to Rome--in golden chains, "like another Palmyra," it is said--and there she was given the beautiful Belvedere for her prison until she attempted an escape in the following June; whereupon, for greater safety, she was transferred to the Castle of Sant' Angelo.

There she remained until May of 1501, when, by the intervention of the King of France, she was set at liberty and permitted to withdraw to Florence to rejoin her children.