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 promptly raised an army, and ordered all who were liable for active service to meet under arms outside the Capene Gate at the temple of Mars; the quaestors were ordered to carry the standards from the treasury to the same place.
After bringing up four legions to full strength, he handed over the rest of the troops to P. Valerius Publicola, the praetor, and advised the senate to raise a second army to protect the republic against any emergency. When all preparations were completed and everything in readiness, he advanced towards the enemy.
With the view of ascertaining their strength before testing it in a decisive action, he seized some rising ground as near to the camp of the Gauls as possible and began to construct the rampart.