The Gauls had not yet taken advantage of their enormous numbers. Defeated on the level ground, they next tried the heights. The Romans were distributed in a ring now fourteen miles in extent. On the north side, beyond the Ose, the works were incomplete, owing to the nature of the ground, and their lines lay on the slope of the hills descending towards the river. Sixty thousand picked men left the Gauls' camp before dawn; they stole round by a distant route, and were allowed to rest concealed in a valley till the middle of the day. At noon they came over the ridge at the Romans' back; and they had the best of the position, being able to attack from above. Their appearance was the signal for a general assault on all sides, and for a determined sally by Vercingetorix from within. Thus before, behind, and everywhere, the legions were assailed at the same moment; and Caesar observes that the cries of battle in the rear are always more trying to men than the fiercest onset upon them in front; because what they cannot see they imagine more formidable than it is, and they depend for their own safety on the courage of others. Caesar had taken his stand where he could command the whole action. There was no smoke in those engagements, and the scene was transparently visible. Both sides felt that the deciding trial had come. In the plain the Gauls made no more impression than on the preceding day. At the weak point on the north the Romans were forced back down the slope, and could not hold their positions. Caesar saw it, and sent Labienus with six cohorts to their help. Vercingetorix had seen it also, and attacked the interior lines at the same spot. Decimus Brutus was then despatched also, and then Caius Fabius. Finally, when the fighting grew desperate, he left his own station; he called up the reserves which had not yet been engaged, and he rode across the field, conspicuous in his scarlet dress and with his bare head, cheering on the men as he passed each point where they were engaged, and hastening to the scene where the chief danger lay. He sent round a few squadrons of horse to the back of the hills which the Gauls had crossed in the morning. He himself joined Labienus. Wherever he went he carried enthusiasm along with him. The legionaries flung away their darts and rushed upon the enemy sword in hand. The cavalry appeared above on the heights. The Gauls wavered, broke, and scattered. The German horse were among them, hewing down the brave but now helpless patriots who had come with such high hopes and had fought so gallantly. Out of the sixty thousand that had sallied forth in the morning, all but a draggled remnant lay dead on the hill-sides. Seventy-four standards were brought in to Caesar. The besieged retired into Alice again in despair. The vast hosts that were to have set them free melted away. In the morning they were streaming over the country, making back for their homes, with