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.
He met the enemy, as though they had had a previous understanding, at a point where he himself was stopped from entering the Samnite country and at the same time barred any movement on their part towards Roman territory or the peaceable lands of her allies.
The two camps confronted each other, and the Samnites, with the recklessness that comes of despair, ventured upon an enterprise which the Romans, who had been so often victorious, would hardly have undertaken, namely an attack on the enemy's camp. Their daring attempt did not achieve its end, but it was not altogether fruitless.
During a great part of the day there had been so dense a fog that it was not only impossible to see anything beyond the rampart, but even people who were together were unable to see each other.
The Samnites, relying on their movements being concealed, came on in the dim twilight —what light there was being obscured by the fog —and
reached the outpost in front of the gate who were keeping a careless look-out, and who being thus attacked unawares had neither the strength nor the courage to offer any resistance. After disposing of the guard they entered the camp through the decuman gate and got
possession of the quaestor's tent, [*](This tent stood in the space between the porta decumana marked R and the Via Quintana marked Q in the plan of a Roman camp in the Class. Dict., where also the cavalry of the allies are marked who would be the nearest to the inrushing enemy. The Via Principalis ran from the one parta principalis (T) to the other (U).) the quaestor, L. Opimius Pansa, being killed. Then there was a general call to arms.
The consul roused by the tumult ordered two of the allied cohorts, those from Luca and Suessa, which happened to be the nearest, to protect the headquarters' tent, and then he mustered the maniples in the via principalis.