They at once set to work to cut down bushes and form them into faggots to fill up the gaps, but as they approached the channel with these they were assailed by volleys of arrows from the bushes on the opposite side. The light armed troops were brought up, and the work of damming the channel at a dozen points, was covered by a shower of javelins and arrows. The Britons, however, had during the past month made shields of strong wicker work of Roman pattern, but long enough to cover them from the eyes down to the ankles, and the wicker work was protected by a double coating of ox hide. Boys collected the javelins as fast as they were thrown, and handed them to the men. As soon as the road across the channel was completed the Romans poured over, believing that now they should scatter their invisible foes; but they were mistaken, for the Britons with levelled spears, their bodies covered with their bucklers, burst down upon them as they crossed, while a storm of darts and javelins poured in from behind the fighting line. Again and again they were driven back, until after suffering great loss they made good their footing at several points, when, at the sound of a horn, resistance at once ceased, and the Britons disappeared as if by magic. Advancing cautiously the Romans found that the ice in all the channels had been broken up, and they were soon involved in a perfect network of sluggish streams. Across these the Britons had felled trees to form bridges for their retreat, and these they dragged after them as soon as they crossed. Every one of these streams was desperately defended, and as the line of swamp grew wider the Roman front became more and more scattered. Late in the afternoon a sudden and furious attack was made upon them from the rear, Beric having taken a strong force round their flank. Numbers of the Romans were killed before they could assemble to make head against the attack, and as soon as they did so their assailants as usual drew off. After a long day's fighting the Romans had gained scarce a mile from the point where resistance had commenced, and this at a cost of over three hundred men. Suetonius himself had commanded the attack, and when the troops halted for the night at the edge of an unusually wide channel, he felt that the task he had undertaken was beyond his powers. He summoned the commanders of the two legions to the hut that had been hastily raised for him.