But despair seemed to furnish the revolution with fresh energies. The consulship was committed to two of its most decided leaders, to Carbo for the third time and to Gaius Marius the younger; the circumstance that the latter, who was just twenty years of age, could not legally be invested with the consulship, was as little heeded as any other point of the constitution. Quintus Sertorius, who in this and other matters proved an inconvenient critic, was ordered to proceed to Etruria with a view to procure new levies, and thence to his province Hither Spain. To replenish the treasury, the senate was obliged to decree the melting down of the gold and silver vessels of the temples in the capital; how considerable the produce was, is clear from the fact that after several months' warfare there was still on hand nearly 600,000 pounds (14,000 pounds of gold and 6000 pounds of silver). In the considerable portion of Italy, which still voluntarily or under compulsion adhered to the revolution, warlike preparations were prosecuted with vigour. Newly-formed divisions of some strength came from Etruria, where the communities of new burgesses were very numerous, and from the region of the Po. The veterans of Marius in great numbers ranged themselves under the standards at the call of his son. But nowhere were preparations made for the struggle against Sulla with such eagerness as in the insurgent Samnium and some districts of Lucania. It was owing to anything but devotion towards the revolutionary Roman government, that numerous contingents from the Oscan districts reinforced their armies; but it was well understood there that an oligarchy restored by Sulla would not acquiesce, like the lax Cinnan government, in the independence of these lands as now de facto subsisting; and therefore the primitive rivalry between the Sabellians and the Latins was roused afresh in the struggle against Sulla.

For Samnium and Latium this war was as much a national struggle as the wars of the fifth century; they strove not for a greater or less amount of political rights, but for the purpose of appeasing long-suppressed hate by the annihilation of their antagonist. It was no wonder, therefore, that the war in this region bore a character altogether different from the conflicts elsewhere, that no compromise was attempted there, that no quarter was given or taken, and that the pursuit was continued to the very uttermost. Thus the campaign of 672 was begun on both sides with augmented military resources and increased animosity. The revolution in particular threw away the scabbard: at the suggestion of Carbo the Roman comitia outlawed all the senators that should be found in Sulla's camp. Sulla was silent; he probably thought that they were pronouncing sentence beforehand on themselves.

The army of the Optimates was divided. The proconsul Metellus undertook, resting on the support of the Picenian insurrection, to advance to Upper Italy, while Sulla marched from Campania straight against the capital. Carbo threw himself in the way of the former; Marius would encounter the main army of the enemy in Latium.

Advancing along the Via Latina, Sulla fell in with the enemy not far from Signia; they retired before him as far as the so-called "Port of Sacer", between Signia and the chief stronghold of the Marians, the strong Praeneste. There Marius drew up his force for battle. His army was about 40,000 strong, and he was in savage fury and personal bravery the true son of his father; but his troops were not the well trained bands with which the latter had fought his battles, and still less might this inexperienced young man bear comparison with the old master of war. His troops soon gave way; the defection of a division even during the battle accelerated the defeat. More than the half of the Marians were dead or prisoners; the remnant, unable either to keep the field or to gain the other bank of the Tiber, was compelled to seek protection in the neighbouring fortresses; the capital, which they had neglected to provision, was irrecoverably lost. In consequence of this Marius gave orders to Lucius Brutus Damasippus, the praetor commanding there, to evacuate it, but before doing so to put to death all the esteemed men, hitherto spared, of the opposite party.

This injunction, by which the son even outdid the proscriptions of his father, was carried into effect; Damasippus made a pretext for convoking the senate, and the marked men were struck down partly in the sitting itself, partly on their flight from the senate-house. Notwithstanding the thorough clearance previously effected, there were still found several victims of note. Such were the former aedile Publius Antistius, the father-in-law of Gnaeus Pompeius, and the former praetor Gaius Carbo, son of the well-known friend and subsequent opponent of the Gracchi[14], since the death of so many men of more distinguished talent the two best orators in the judicial courts of the desolated Forum; the consular Lucius Domitius, and above all the venerable pontifex maximus Quintus Scaevola, who had escaped the dagger of Fimbria only to bleed to death during these last throes of the revolution in the vestibule of the temple of Vesta entrusted to his guardianship. With speechlesshorror the multitude saw the corpses of these last victims of the reign of terror dragged through the streets, and thrown into the river.

The broken bands of Marius threw themselves into the neighbouring and strong cities of new burgesses Norba and Praeneste: Marius in person with the treasure and the greater part of the fugitives entered the latter. Sulla left an able officer, Quintus Ofella, before Praeneste just as he had done in the previous year before Capua, with instructions not to expend his strength in the siege of the strong town, but to enclose it with an extended line of blockade and starve it into surrender. He himself advanced from different sides upon the capital, which as well as the whole surrounding district he found abandoned by the enemy, and occupied without resistance. He barely took time to compose the minds of the people by an address and to make the most necessary arrangements, and immediately passed on to Etruria, that in concert with Metellus he might dislodge his antagonists from Northern Italy.

Metellus had meanwhile encountered and defeated Carbo's lieutenant Carrinas at the river Aesis (Esino between Ancona and Sinigaglia), which separated the district of Picenum from the Gallic province; when Carbo in person came up with his superior army, Metellus had been obliged to abstain from any farther advance. But on the news of the battle at Sacriportus, Carbo, anxious about his communications, had retreated to the Flaminian road, with a view to take up his headquarters at the meeting-point of Ariminum, and from that point to hold the passes of the Apennines on the one hand and the valley of the Po on the other. In this retrograde movement different divisions fell into the hands of the enemy, and not only so, but Sena Gallica was stormed and Carbo's rearguard was broken in a brilliant cavalry engagement by Pompeius; nevertheless Carbo attained on the whole his object. The consular Norbanus took the command in the valley of the Po; Carbo himself proceeded to Etruria. But the march of Sulla with his victorious legions to Etruria altered the position of affairs; soon three Sullan armies from Gaul, Umbria, and Rome established communications with each other. Metellus with the fleet went past Ariminum to Ravenna, and at Faventia cut off the communication between Ariminum and the valley of the Po, into which he sent forward a division along the great road to Placentia under Marcus Lucullus, the quaestor of Sulla and brother of his admiral in the Mithradatic war. The young Pompeius and his contemporary and rival Crassus penetrated from Picenum by mountain-paths into Umbria and gained the Flaminian road at Spoletium, where they defeated Carbo's legate Carrinas and shut him up in the town; he succeeded, however, in escaping from it on a rainy night and making his way, though not without loss, to the army of Carbo. Sulla himself marched from Rome into Etruria with his army in two divisions, one of which advancing along the coast defeated the corps opposed to it at Saturnia (between the rivers Ombrone and Albegna); the second led by Sulla in person fell in with the army of Carbo in the valley of the Clanis, and sustained a successful conflict with his Spanish cavalry. But the pitched battle which was fought between Carbo and Sulla in the region of Chiusi, although it ended without being properly decisive, was so far at any rate in favour of Carbo that Sulla's victorious advance was checked.