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.
They had concealed themselves in a secluded valley, prepared to attack the Romans, should they enter the valley, from the rising ground on each side. Fabius removed the baggage into a safe place and left a small guard over it.