The Gauls were eager for news, besieging merchants and travellers for gossip,(20) easily influenced, sanguine, credulous, fond of change, and wavering in their counsels. They were at the same time remarkably acute and intelligent, very quick to seize upon and to imitate any contrivance they found useful. Their ingenuity in baffling the novel siege apparatus of the Roman armies is specially noticed by Cæsar. Of their courage he speaks with great respect, attributing their scorn of death, in some degree at least, to their firm faith in the immortality of the soul.(21) A people who in earlier days had again and again annihilated Roman armies, had sacked Rome, and who had more than once placed Cæsar himself in positions of the utmost anxiety and peril, were evidently no weaklings, whatever their religious beliefs or practices. Cæsar is not given to sentimental admiration of his foes, but one episode at the siege of Avaricum moves him to immortalise the valour of the defence. A wooden structure or _agger_ had been raised by the Romans to overtop the walls, which had proved impregnable to the assaults of the battering-ram. The Gauls contrived to set this on fire. It was of the utmost moment to prevent the besiegers from extinguishing the flames, and a Gaul mounted a portion of the wall above the _agger_, throwing down upon it balls of tallow and pitch, which were handed up to him from within. He was soon struck down by a missile from a Roman catapult. Immediately another stepped over him as he lay, and continued his comrade’s task. He too fell, but a third instantly took his place, and a fourth; nor was this post ever deserted until the legionaries at last extinguished the flames and forced the defenders back into the town, which was finally captured on the following day. *Strabo on the Celts*