But though Caesar had kept his intentions quiet, the Orsini had been forewarned, and, taking out all the troops they had by the gate of San Pancracio, they had made along detour and blocked Caesar's way; so, when the latter arrived at Storta, he found the Orsini's army drawn up awaiting him in numbers exceeding his own by at least one-half.
Caesar saw that to come to blows in his then feeble state was to rush on certain destruction; so he ordered his troops to retire, and, being a first-rate strategist, echelonned his retreat so skilfully that his enemies, though they followed, dared not attack him, and he re-entered the pontifical town without the loss of a single man.
This time Caesar went straight to the Vatican, to put himself more directly under the pope's protection; he distributed his soldiers about the palace, so as to guard all its exits. Now the Orsini, resolved to make an end of Caesar, had determined to attack him wheresoever he might be, with no regard to the sanctity of the place: this they attempted, but without success, as Caesar's men kept a good guard on every side, and offered a strong defence.
Then the Orsini, not being able to force the guard of the Castle Sant' Angelo, hoped to succeed better with the duke by leaving Rome and then returning by the Torione gate; but Caesar anticipated this move, and they found the gate guarded and barricaded. None the less, they pursued their design, seeking by open violence the vengeance that they had hoped to obtain by craft; and, having surprised the approaches to the gate, set fire to it: a passage gained, they made their way into the gardens of the castle, where they found Caesar awaiting them at the head of his cavalry.
Face to face with danger, the duke had found his old strength: and he was the first to rush upon his enemies, loudly challenging Orsino in the hope of killing him should they meet; but either Orsino did not hear him or dared not fight; and after an exciting contest, Caesar, who was numerically two-thirds weaker than his enemy, saw his cavalry cut to pieces; and after performing miracles of personal strength and courage, was obliged to return to the Vatican. There he found the pope in mortal agony: the Orsini, tired of contending against the old man's word of honour pledged to the duke, had by the interposition of Pandolfo Petrucci, gained the ear of the pope's surgeon, who placed a poisoned plaster upon a wound in his leg.
The pope then was actually dying when Caesar, covered with dust and blood, entered his room, pursued by his enemies, who knew no check till they reached the palace walls, behind which the remnant of his army still held their ground.
Pius III, who knew he was about to die, sat up in his bed, gave Caesar the key of the corridor which led to the Castle of Sant' Angelo, and an order addressed to the governor to admit him and his family, to defend him to the last extremity, and to let him go wherever he thought fit; and then fell fainting on his bed.
Caesar took his two daughters by the hand, and, followed by the little dukes of Sermaneta and Nepi, took refuge in the last asylum open to him.
The same night the pope died: he had reigned only twenty-six days.
After his death, Caesar, who had cast himself fully dressed upon his bed, heard his door open at two o'clock in the morning: not knowing what anyone might want of him at such an hour, he raised himself on one elbow and felt for the handle of his sword with his other hand; but at the first glance he recognised in his nocturnal visitor Giuliano della Rovere.