Labienus, when sent on his separate command, had made Sens his head-quarters. All down the Seine the country was in insurrection. Leaving the new Italian levies at the station, he went with his experienced troops down the left bank of the river till he came to the Essonne. He found the Gauls entrenched on the other side, and, without attempting to force the passage, he marched back to Melun, where he repaired a bridge which the Gauls had broken, crossed over, and descended without interruption to Paris. The town had been burnt, and the enemy were watching him from the further bank. At this moment he heard of the retreat from Gergovia, and of the rebellion of the Aedui. Such news, he understood at once, would be followed by a rising in Belgium. Report had said that Caesar was falling back on the province. He did not believe it. Caesar, he knew, would not desert him. His own duty, therefore, was to make his way back to Sens. But to leave the army of Gauls to accompany his retreat across the Seine, with the tribes rising on all sides, was to expose himself to the certainty of being intercepted. "In these sudden difficulties," says Caesar, "he took counsel from the valor of his mind." [6] He had brought a fleet of barges with him from Melun. These he sent down unperceived to a point at the bend of the river four miles below Paris, and directed them to wait for him there. When night fell he detached a few cohorts with orders to go up the river with boats as if they were retreating, splashing their oars, and making as much noise as possible. He himself with three legions stole silently in the darkness to his barges, and passed over without being observed. The Gauls, supposing the whole army to be in flight for Sens, were breaking up their camp to follow in boisterous confusion. Labienus fell upon them, telling the Romans to fight as if Caesar was present in person; and the courage with which the Gauls fought in their surprise only made the overthrow more complete. The insurrection in the north-west was for the moment paralysed, and Labienus, secured by his ingenious and brilliant victory, returned to his quarters without further accident. There Caesar came to him as he expected, and the army was once more together.