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.
There was no doubt but that the Romans would assist the Lucerians for the sake of protecting their allies and preventing the whole of Apulia from being intimidated by the Samnites into open revolt. The only matter for consideration was what route they would take.
There were two roads leading to Luceria; one along the Adriatic Coast through open country, the longer one of the two but so much the safer; the other and shorter one through the Caudine Forks.
This is the character of the spot; there are two passes, deep, narrow, with wooded hills on each side, and a continuous chain of mountains extends from one to the other. Between them lies a watered grassy plain through the middle of which the road goes.
Before you reach the plain you have to pass through the first defile and either return by the same path by which you entered or, if you go on, you must make your way out by a still narrower and more difficult pass at the other end. The Roman column descended into this plain from the first defile with its overhanging cliffs, and marched straight through to the other pass.
They found it blocked by a huge barricade of felled trees with great masses of rock piled against them. No sooner did they become aware of the enemy's stratagem than his outposts showed themselves on the heights above the pass.