The History of Rome (1.14.8-1.15.1)

The cavalry continued these tactics and so made the flight which they were to feign seem less suspicious, and when their apparent hesitation whether to fight or to flee was followed by the retirement of the infantry, the enemy suddenly poured out of the crowded gates, broke the Roman line and pressed on in eager pursuit till they were brought to where the ambush was set.

Then the Romans suddenly rose and attacked the enemy in flank; their panic was increased by the troops in the camp bearing down upon them. Terrified by the threatened attacks from all sides, the Fidenates turned and fled almost before Romulus and his men could wheel round from their simulated flight.

They made for their town much more quickly than they had just before pursued those who pretended to flee, for their flight was a genuine one.

They could not, however, shake off the pursuit; the Romans were on their heels, and before the gates could be closed against them, burst through pell-mell with the enemy.

The[*] contagion of the war-spirit in Fidenae infected the Veientes. This people were connected by ties of blood with the Fidenates, who were also Etruscans, and an additional incentive was supplied by the mere proximity of the place, should the arms of Rome be turned against all her neighbours. They made an incursion into Roman territory, rather for the sake of plunder than as an act of regular war.