Niccolò Machiavelli
Discourses on the First Decade of Titus Livius (Chap. 3.45)
Whether in battle it is better to await and repel the Enemy's attack, or to anticipate it by an impetuous onset.

Decius and Fabius, the Roman consuls, were each of them in command of a separate army, one directed against the Samnites, the other against the Etruscans: and as both delivered battle, we have to pronounce, in respect of the two engagements, which commander followed the better method. Decius attacked his enemy at once with the utmost fury and with his whole strength. Fabius was content, at first, merely to maintain his ground; for judging that more was to be gained by a later attack, he reserved his forces for a final effort, when the ardour of the enemy had cooled and his energy spent itself. The event showed Fabius to be more successful in his tactics than Decius, who being exhausted by his first onset, and seeing his ranks begin to waver, to secure by death the glory he could no longer hope from victory, followed the example set him by his father, and sacrificed himself to save the Roman legions. Word whereof being brought to Fabius, he, to gain, while he yet lived, as much honour as the other had earned by his death, pushed forward all the troops he had reserved for his final effort, and so obtained an unexampled victory. Whence we see that of the two methods, that of Fabius was the safer and the more deserving our imitation.