At the news of this great movement Caesar immediately left Italy, and returned to Gaul. He had one quality, rare even amongst the greatest men: he remained cool amidst the very hottest alarms; necessity never hurried him into precipitation, and he prepared for the struggle as if he were always sure of arriving on the spot in time to sustain it. He was always quick, but never hasty; and his activity and patience were equally admirable and efficacious. Starting from Italy at the beginning of 702 A. U. C., he passed two months in traversing within Gaul the Roman province and its neighborhood, in visiting the points threatened by the insurrection, and the openings by which he might get at it, in assembling his troops, in confirming his wavering allies; and it was not before the early part of March that he moved with his whole army to Agendicum (Sens), the very centre of revolt, and started thence to push on the war with vigor. In less than three months he had spread devastation throughout the insurgent country; he had attacked and taken its principal cities, Vellaunodunum (Trigueres), Genabum (Gien), Noviodunum (Sancerre), and Avaricum (Bourges), delivering up everywhere country and city, lands and inhabitants, to the rage of the Roman soldiery, maddened at having again to conquer enemies so often conquered. To strike a decisive blow, he penetrated at last to the heart of the country of the Arvernians, and laid siege to Gergovia, their capital and the birthplace of Vercingetorix.