Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
Mars.” The Gauls were stationed on the right, the Samnites on the left.[*](Where the Umbrians were and why they did not take part in this battle are questions to which our extant authorities vouchsafe no reply.) Q. Fabius posted the first and third legions on the right wing, facing the Samnites; to oppose the Gauls, Decius had the fifth and sixth legions, who formed the Roman
left. The second and fourth legions were engaged in Samnium with L. Volumnius the proconsul. When the armies first met they were so evenly matched that had the Etruscans and Umbrians been present, whether taking part in the battle or attacking the camp, the Romans must have been defeated.
But although neither side was gaining any advantage and Fortune had not yet indicated in any way to whom she would grant the victory, the fighting on the right wing was very different from that on the left.
The Romans under Fabius were acting more on the defensive and were protracting the contest as long as possible.
Their commander knew that it was the habitual practice of both the Gauls and the Samnites to make a furious attack to begin with, and if that were successfully resisted, it was enough;
the courage of the Samnites gradually sank as the battle went on, whilst the Gauls, utterly unable to stand heat or exertion, found their physical strength melting away; in their first efforts they were more than men, in the end they were weaker than women.
Knowing this, he kept the strength of his men unimpaired against the time when the enemy usually began to show signs of defeat. Decius, as a younger man, possessing more vigour of mind, showed more dash;
he made use of all the strength he possessed in opening the attack, and as the infantry battle developed too slowly for him, he called on the cavalry.
Putting himself at the head of a squadron of exceptionally gallant troopers, he appealed to them as the pick of his soldiers to follow him in charging the enemy, for a twofold glory would be theirs if victory began on the left wing and, in that wing, with the cavalry. Twice they swept aside the Gaulish horse.
Making a third charge, they were carried too far, and whilst they were now fighting desperately in the midst of the enemy's cavalry they were thrown into consternation by a new style of warfare.