Owing to the critical aspect of affairs, the senate ordered Mamercus Aemilius to be proclaimed Dictator. He chose as his Master of the Horse L. Quinctius Cincinnatus, who had been his colleague in the college of consular tribunes the previous year, a young man worthy of his father.

To the force levied by the consuls were added a number of war-seasoned veteran centurions, to fill up the number of those lost in the late battle. The Dictator ordered Quinctius Capitolinus and M. Fabius Vibulanus to accompany him as seconds in command.

The higher power of the Dictator, wielded by a man quite equal to it, dislodged the enemy from Roman territory and sent him across the Anio. He occupied the line of hills between Fidenae and the Anio, where he entrenched himself, and did not go down into the plains until the legions of Falerii had come to his support.

Then the camp of the Etruscans was formed in front of the walls of Fidenae. The Roman Dictator chose a position not far from them at the junction of the Anio and the Tiber, and extended his lines as far as possible from the one river to the other. The next day he led his men out to battle.

Amongst the enemy there was diversity of opinion. The men of Falerii, impatient at serving so far from home, and full of self-confidence, demanded battle; those of Veii and Fidenae placed more hope in a prolongation of the war.

Although Tolumnius was more inclined to the opinion of his own men, he announced that he would give battle the next day, in case the Faliscans should refuse to serve through a protracted campaign.