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.
Aemilius marched thither to raise the siege, and selected a site before the city where he entrenched himself. His camp was plentifully supplied with provisions from Sutrium.
The Etruscans spent the day after his arrival in discussing whether they should bring on an immediate engagement or protract the war. Their generals decided upon the more energetic course as the safer one, and the next day at sunrise the signal for battle was displayed and the troops marched into the field.