The peoples, but lately divided by rivalries, customs, and tradition, forget their reciprocal grievances, and unite under him. Foreign oppression creates nationalities much more than community of ideas and interests. Had Vercingetorix formerly, like so many others, bent his brow under the Roman domination? Dio Cassius is the only historian who says so. Be this as it may, he shows himself, as early as the year 702, the firm and intrepid adversary of the invaders. His plan is as bold as it is well combined: to create in the heart of Gaul a great centre of insurrection, protected by the mountains of the Cévennes and of Auvergne; from this natural fortress to throw his lieutenants upon the Narbonnese, whence Cæsar would be no longer able to draw either succours or provisions; to prevent even the Roman general from returning to his army; to attack separately the legions while deprived of their chief, urge into insurrection the centre of Gaul, and destroy the _oppidum_ of the Boii, that small people, the remains of the defeat of the Helvetii, placed by Cæsar at the confluence of the Allier and the Loire as an advance sentinel. Informed of these events, Cæsar quits Italy in haste, followed by a small number of troops raised in the Cisalpine. On his descent from the Alps, he finds himself almost alone in presence of wavering allies, and of the greatest part of Gaul in revolt, while his legions are dispersed at a distance on the Moselle, the Marne, and the Yonne. So many perils excite his ardour instead of abating it, and his resolution is soon taken. He is going to draw his enemies, by successful and multiplied diversions, to the points where he intends to strike decisive blows; and by sending his infantry into the Vivarais, his cavalry to Vienne, and proceeding in person to Narbonne, he divides the attention of his adversaries, in order to conceal his designs. His presence in the Roman province is equivalent to an army. He encourages the men who have remained faithful, intimidates the others; doubles, with the local resources, all the garrisons of the towns of the Province as far as Toulouse; and, after having thus raised in the south a barrier against all invasion, he returns, and arrives at the foot of the Cévennes, in the Vivarais, where he finds the troops which had been sent forward. He then crosses the mountains covered with snow, penetrates into Auvergne, and obliges Vercingetorix to abandon Berry, in order to hasten to defend his own country, which is threatened. Satisfied with this result, he starts unexpectedly, and, almost alone, hastens to Vienne. He takes the escort of cavalry which had preceded him, reaches the country of Langres, and proceeds thence to Sens, where he brings together his ten legions. Thus, in little time, he has placed the Roman Province in security from any attack, forced Vercingetorix to fly to the defence of Auvergne, and rejoined and concentrated his army.