VIII. The power of Rome had increased considerably. The Samnites, who hitherto had played the first part, were no longer in a condition to plan further coalitions, and one people alone could hardly be rash enough to provoke the Republic. Yet the Lucanians, always hesitating, gave this time the signal for a general revolt. The attack on Thurium, by the Lucanians and Bruttians, became the occasion of a new league, into which entered successively the Tarentines, the Samnites, the Etruscans, and even the Gauls. The north was soon in flames, and Etruria again became the battle-field. A Roman army, which had hastened to relieve Arretium, was put to rout by the Etruscans united with Gaulish mercenaries. The Senones, to whom these belonged, having massacred the Roman ambassadors sent to expostulate on their violation of the treaty with the Republic, the Senate sent against them two legions who drove them back beyond the Rubicon. The Gaulish tribe of the Boians, alarmed by the fate of the Senones, descended immediately into Umbria, and, rallying the Etruscans, prepared to march to renew the sack of Rome; but their march was arrested, and two successive victories, at Lake Vadimo, (471) and Populonia (472), enabled the Senate to conclude a convention which drove back the Boians into their old territory. Hostilities continued with the Etruscans during two years, after which their submission completed the conquest of Northern Italy. [Sidenote: Pyrrhus in Italy. Submission of Tarentum (474-488).] IX. Free to the north, the Romans turned their efforts against the south of Italy; war was declared against Tarentum, the people of which had attacked a Roman flotilla. While the consul Æmilius invested the town, the first troops of Pyrrhus, called in by the Tarentines, disembarked in the port (474).