Titus Livius... observes, “Most wholesome is it that in affairs of great moment, supreme authority be vested in one man.” Very different, however, is… - Niccolò Machiavelli

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Titus Livius... 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.