The consuls led their main force to join the troops left with Scipio; one army of reserve, under the proprætor Cn. Fulvius, was stationed in the Faliscan; another, under the proprætor L. Postumius, in the Vatican district. But the Gauls, pouring in by the pass of Camerinum, had annihilated a Roman legion left to defend it; their numerous cavalry spread over Umbria and got between Scipio and Rome; and as they rode up to the consular army, the heads of the slain Romans which they carried on spears and hung at their horses’ breasts, made the Romans believe that Scipio’s whole army had been destroyed. A junction however was formed with him, and the proconsul L. Volumnius, who commanded in Samnium, was directed to lead his legions to reinforce those of the consuls. The three united armies then crossed the Apennines, and took a position in the Sentine country to menace the possessions of the Senonian Gauls; and the two armies of reserve advanced in proportion, the one to Clusium, the other to the Faliscan country. The confederates came and encamped before the Romans; but they avoided an action, probably waiting for reinforcements. The consuls, learning by deserters that the plan of the enemy was for the Gauls and Samnites to give them battle, and the Etruscans and Umbrians to fall on their camp during the action, sent orders to Fulvius to ravage Etruria: this called a large part of the Etruscans home, and the consuls endeavoured to bring on an engagement during their absence. For two entire days they sought in vain to draw the confederates to the field; on the third their challenge was accepted. Fabius commanded on the right, opposed to the Samnites and the remaining Etruscans and Umbrians; Decius led the left wing against the Gauls. Ere the fight began, a wolf chased a hind from the mountains down between the two armies; the hind sought refuge among the Gauls, by whom she was killed; the wolf ran among the Romans, who made way for him to pass; and this appearance of the favourite of Mars was regarded as an omen of victory.