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.
According to another tradition they were not Gauls at all, but Umbrians, nor was there a great disaster; a foraging party commanded by L. Manlius Torquatus, a staff officer, was surrounded, but Scipio sent assistance from the camp, and in the end the Umbrians were defeated and the prisoners and booty recovered.
It is more probable that this defeat was inflicted by Gauls and not by Umbrians, for the fears of an irruption of Gauls which had been so often aroused were especially present to the minds of the citizens this year, and every precaution was taken to meet it.