At the same time operations had also begun in Central Italy, where the revolt of the Abruzzi and the region of the Fucine lake threatened the capital in dangerous proximity. An independent corps under Gnaeus Pompeius Strabo was sent into Picenum in order that, resting for support on Firmum and Falerio, it might threaten Asculum; but the main body of the Roman northern army took its position under the consul Lupus on the borders of the Latin and Marsian territories, where the Valerian and Salarian highways brought the enemy nearest to the capital; the rivulet Tolenus (Turano), which crosses the Valerian road between Tibur and Alba and falls into the Velino at Rieti, separated the two armies. The consul Lupus impatiently pressed for a decision, and did not listen to the disagreeable advice of Marius that he should exercise his men - unaccustomed to service - in the first instance in petty warfare. At the very outset the division of Gaius Perpenna, 10,000 strong, was totally defeated. The commander-in-chief deposed the defeated general from his command and united the remnant of the corps with that which was under the orders of Marius, but did not allow himself to be deterred from assuming the offensive and crossing the Tolenus in two divisions, led partly by himself, partly by Marius, on two bridges constructed not far from each other.

Publius Scato with the Marsians confronted them; he had pitched his camp at the spot where Marius crossed the brook, but, before the passage took place, he had withdrawn thence, leaving behind the mere posts that guarded the camp, and had taken a position in ambush farther up the river. There he attacked the other Roman corps under Lupus unexpectedly during the crossing, and partly cut it down, partly drove it into the river (11th June 664). The consul in person and 8000 of his troops fell. It could scarcely be called a compensation that Marius, becoming at length aware of Scato's departure, had crossed the river and not without loss to the enemy occupied their camp. Yet this passage of the river, and a victory at the same time obtained over the Paelignians by the general Servius Sulpicius, compelled the Marsians to draw their line of defence somewhat back, and Marius, who by decree of the senate succeeded Lupus as commander-in-chief, at least prevented the enemy from gaining further successes. But, when Quintus Caepio was soon afterwards associated in the command with equal powers, not so much on account of a conflict which he had successfully sustained, as because he had recommended himself to the equites then leading the politics of Rome by his vehement opposition to Drusus, he allowed himself to be lured into an ambush by Silo on the pretext that the latter wished to betray to him his army, and was cut to pieces with a great part of his force by the Marsians and Vestinians.

Marius, after Caepio's fall once more sole commander-in-chief, through his tenacious resistance prevented his antagonist from profiting by the advantages which he had gained, and gradually penetrated far into the Marsian territory. He long refused battle; when he at length gave it, he vanquished his impetuous opponent, who left on the battle - field among other dead Herius Asinius the chieftain of the Marrucini. In a second engagement the army of Marius and the corps of Sulla which belonged to the army of the south co-operated to inflict on the Marsians a still more considerable defeat, which cost them 6000 men; but the glory of this day remained with the younger officer, for, while Marius had given and gained the battle, Sulla had intercepted the retreat of the fugitives and destroyed them.

While the conflict was proceeding thus warmly and with varying success at the Fucine lake, the Picenian corps under Strabo had also fought with alternations of fortune. The insurgent chiefs, Gaius Iudacilius from Asculum, Publius Vettius Scato, and Titus Lafrenius, had assailed it with their united forces, defeated it, and compelled it to throw itself into Firmum, where Lafrenius kept Strabo besieged, while Iudacilius moved into Apulia and induced Canusium, Venusia, and the other towns still adhering to Rome in that quarter to join the insurgents. But on the Roman side Servius Sulpicius by his victory over the Paeligni cleared the way for his advancing into Picenum and rendering aid to Strabo; Lafrenius was attacked by Strabo in front and taken in rear by Sulpicius, and his camp was set on fire; he himself fell, the remnant of his troops fled in disorder and threw themselves into Asculum. So completely had the state of affairs changed in Picenum, that the Italians now found themselves confined to Asculum as the Romans were previously to Firmum, and the war was thus once more converted into a siege.

Lastly, there was added in the course of the year to the two difficult and straggling wars in southern and central Italy a third in the north. The state of matters apparently so dangerous for Rome after the first months of the war had induced a great portion of the Umbrian, and isolated Etruscan, communities to declare for the insurrection; so that it became necessary to despatch against the Umbrians Aulus Plotius, and against the Etruscans Lucius Porcius Cato. Here however the Romans encountered a far less energetic resistance than in the Marsian and Samnite countries, and maintained a most decided superiority in the field.

Disadvantageous Aggregate Result of the First Year of the War Thus the severe first year of the war came to an end, leaving behind it, both in a military and political point of view, sorrowful memories and dubious prospects. In a military point of view both armies of the Romans, the Marsian as well as the Campanian, had been weakened and discouraged by severe defeats; the northern army had been compelled especially to attend to the protection of the capital, the southern army at Neapolis had been seriously threatened in its communications, as the insurgents could without much difficulty break forth from the Marsian or Samnite territory and establish themselves between Rome and Naples; for which reason it was found necessary to draw at least a chain of posts from Cumae to Rome. In a political point of view, the insurrection had gained ground on all sides during this first year of the war; the secession of Nola, the rapid capitulation of the strong and large Latin colony of Venusia, and the Umbro-Etruscan revolt were suspicious signs that the Roman symmachy was tottering to its very base and was not in a position to hold out against this last trial. They had already made the utmost demands on the burgesses; they had already, with a view to form that chain of posts along the Latino-Campanian coast, incorporated nearly 6000 freedmen in the burgess-militia; they had already required the severest sacrifices from the allies that still remained faithful; it was not possible to draw the string of the bow any tighter without hazarding everything.

The temper of the burgesses was singularly depressed. After the battle on the Tolenus, when the dead bodies of the consul and the numerous citizens of note who had fallen with him were brought back from the neighbouring battlefield to the capital and were buried there; when the magistrates in token of public mourning laid aside their purple and insignia; when the government issued orders to the inhabitants of the capital to arm en masse; not a few had resigned themselves to despair and given up all as lost. It is true that the worst despondency had somewhat abated after the victories achieved by Caesar at Acerrae and by Strabo in Picenum: on the news of the former the wardress in the capital had been once more exchanged for the dress of the citizen, on the news of the second the signs of public mourning had been laid aside; but it was not doubtful that on the whole the Romans had been worsted in this passage of arms: and above all the senate and the burgesses had lost the spirit, which had formerly borne them to victory through all the crises of the Hannibalic war. They still doubtless began war with the same defiant arrogance as then, but they knew not how to end it as they had then done; rigid obstinacy, tenacious persistence had given place to a remiss and cowardly disposition. Already after the first year of war their outward and inward policy became suddenly changed, and betook itself to compromise.