show his jealousy of him by opposing him, he betrayed it by his silence, and by being so careless and indifferent about everything, that he gave no help in the business of the siege either by word or deed, just as though he had been a person of no account. But when, in consequence of an accident, Giovambattista had to return to Florence, all this was changed; for Luca, remaining in sole charge, behaved with the greatest courage, prudence, and zeal, all which qualities had been hidden while he held a joint command. Further to bear me out I shall again borrow the words of Titus Livius, who, in relating how when Quintius and Agrippa his colleague were sent by the Romans against the Equians, Agrippa contrived that the conduct of the war should rest with Quintius, observes, “Most wholesome is it that in affairs of great moment, supreme authority be vested in one man.” Very different, however, is the course followed by the republics and princes of our own days, who, thinking to be better served, are used to appoint several captains or commissioners to fill one command; a practice giving rise to so much confusion, that were we seeking for the causes of the overthrow of the French and Italian armies in recent times, we should find this to be the most active of any.
Rightly, therefore, may we conclude that in sending forth an army upon service, it is wiser to entrust it to one man of ordinary prudence, than to two of great parts but with a divided command.