The year 458 however passed away, apparently, in armings and marchings.

For the following year (459) the Romans placed their two best generals, Publius Decius Mus and the aged Quintus Fabius Rullianus, at the head of their army in Etruria, which was reinforced with all the troops that could be spared from Campania, and amounted to at least 60,000 men, of whom more than a third were full burgesses of Rome.

Besides this, two reserves were formed, the first at Falerii, the second under the walls of the capital.

The rendezvous of the Italians was Umbria, towards which the roads from the Gallic, Etruscan, and Sabellian territories converged; towards Umbria the consuls also moved off their main force, partly along the left, partly along the right bank of the Tiber, while at the same time the first reserve made a movement towards Etruria, in order if possible to recall the Etruscan troops from the main scene of action for the defence of their homes.

The first engagement did not prove fortunate for the Romans; their advanced guard was defeated by the combined Gauls and Samnites in the district of Chiusi.