During nearly thirty years the Gauls thus scoured not only Upper Italy, which they had almost to themselves, but all the eastern coast, and up to the head of the peninsula, encountering along the Adriatic, and in the rich and effeminate cities of Magna Graecia, Sybaris, Tarentum, Crotona, and Locri, no enemy capable of resisting them. But in the year 391 B.C., finding themselves cooped up in their territory, a strong band of Gauls crossed the Apennines, and went to demand from the Etruscans of Clusium the cession of a portion of their lands. The only answer Clusium made was to close her gates. The Gauls formed up around the walls. Clusium asked help from Rome, with whom, notwithstanding the rivalry between the Etruscan and Roman nations, she had lately been on good terms. The Romans promised first their good offices with the Gauls, afterwards material support; and thus were brought face to face those two peoples, fated to continue for four centuries a struggle which was to be ended only by the complete subjection of Gaul. The details of that struggle belong specially to Roman history; they have been transmitted to us only by Roman historians; and the Romans it was who were left ultimately in possession of the battle-field, that is, of Italy. It will suffice here to make known the general march of events and the most characteristic incidents. Four distinct periods may be recognized in this history; and each marks a different phase in the course of events, and, so to speak, an act of the drama. During the first period, which lasted forty-two years, from 391 to 349 B.C., the Gauls carried on a war of aggression and conquest against Rome. Not that such had been their original design; on the contrary, they replied, when the Romans offered intervention between them and Clusium, “We ask only for lands, of which we are in need; and Clusium has more than she can cultivate. Of the Romans we know very little; but we believe them to be a brave people, since the Etruscans put themselves under their protection. Remain spectators of our quarrel; we will settle it before your eyes, that you may report at home how far above other men the Gauls are in valor.”