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..