provisions, and to compel them through famine to retire into the Narbonnese--a hope which was so much the better founded, as the Loire, swollen by the melting of the snow, appeared to be nowhere fordable. Cæsar was informed of these events during his march from the Allier towards the Loire. His position had never been more critical. Suffering under a severe defeat, separated from Labienus by a distance of more than eighty leagues, and by countries in revolt, he was surrounded on all sides by the insurrection: he had on his rear the Arverni, elated with their recent success at Gergovia; on his left the Bituriges, irritated by the sack of Avaricum; before him the Ædui, ready to dispute the passage of the Loire. Was he to persevere in his design, or retrograde towards the Province? He could not resolve on this latter course, for not only would this retreat have been disgraceful, and the passage of the Cévennes full of difficulties, but, above all, he felt the greatest anxiety for Labienus and the legions which he had entrusted to him. He therefore persevered in his first resolutions; and in order to be able, in case of need, to build a bridge across the Loire before the forces of the enemies were increased, he proceeded towards that river by forced marches day and night, and arrived unexpectedly at Bourbon-Lancy.[500] The cavalry soon discovered a ford which necessity made them consider practicable, although the soldiers had only above water their shoulders and their arms to carry their weapons. The cavalry was placed up the stream, in order to break the current, and the army passed without accident before the enemy had time to recover from his first surprise. Cæsar found the country covered with the harvest and with cattle, with which the army was largely provisioned, and he marched towards the land of the Senones.[501] [Sidenote: Expedition of Labienus against the Parisii.] IX. Whilst the centre of Gaul was the scene of these events, Labienus had marched with four legions towards Lutetia, a town situated on an island in the Seine, the _oppidum_ of the Parisii. After leaving his baggage at Agedincum (_Sens_)[502] under the guard of the troops recently arrived from Italy to fill up the voids, he followed the left bank of the Yonne and of the Seine, wishing to avoid all important streams and considerable towns.[503] At the news of his approach, the enemy assembled in great numbers from the neighbouring countries. The command was entrusted to Aulercus Camulogenus, who was elevated to this honour, notwithstanding his great age, on account of his rare ability in the art of war. This chief, having remarked that a very extensive marsh sloped towards the Seine, and rendered impracticable all that part of the country which is watered by the Essonne, established his troops along the side of this marsh, in order to defend the passage. (_See Plate 23._)