It did not take long for Constans to arouse and collect his men; tired of inaction, they were only too glad to respond to the summons. And at the last, Constans, unable to withstand the entreaty in Red Oxenford's eyes, ordered his release.
"But, with the others, you must wait upon my word," he said, sternly, and Oxenford, fearful above all things of being left behind, gave ready assent to the condition.
Under the south rampart of the citadel they halted. There were but two guards on duty here, and they were easily surprised and secured before they could give an alarm. As one by one the rest of the company ascended the scaling-ladder, they were ordered to throw themselves prone on the flat top of the wall, to await the final signal. Over at the north gate the clamor grew momentarily—there were blows of axes on wood, and clash of arms, and the confused crying of many voices.
"The snapping-turtle must be at his work," said Constans to himself. "Wait until his teeth show through that flimsy wooden screen."
Piers Major had advanced promptly upon receiving the message brought by his son. The chances of a frontal attack had already been discussed between him and Constans, and the latter had devised a formation which, in theory at least, should make such an undertaking feasible. In its basic idea it was the Roman testudo, described by Julius Cæsar in the Gallic Commentaries. The phalanx of marching men were protected from arrows, darts, and ordinary missiles by a continuous covering formed of their ox-hide shields, the latter being held horizontally above the head and interlocked. The overlapping shields bore a fanciful resemblance to the scaly carapace of a tortoise—hence its name; and, so long as the essential principle of unity of action was maintained, it might be reckoned an effective engine of warfare.
As the testudo moved down the Palace Road and towards the wooden barrier of the north gate, it was to be observed that the front-rank men and the file-closers carried their shields in the ordinary fashion, in order to ward off horizontally flying missiles. Once under the shelter of the walls, the leaders would immediately discard their now useless bucklers and begin to ply their axes, protected from overhead assaults by the overlapping shields of their comrades. The formation advanced steadily; there was a suggestion of terrific irresistibility in the very slowness of its progress; to the eager fancy it might have been the veritable recreation of some prehistoric monster, the illusion being heightened by the torchlight that flickered uncertainly over the rounded bellies of the shields of greenish leather and was reflected redly from their copper bosses.
The defence had been quick to recognize the character of the assault, and had done their best to repel it. The catapults had been brought into action, and their huge projectiles hurtled constantly through the air, but for the most part innocuously, the machines not being in the best of order and the artillerymen unpractised in their use. It was not until the testudo had advanced to within fifty yards that a shot discharged by a machine, worked by Quinton Edge in person, took effect, the missile striking the testudo on the left wing and disabling three men. Before the advantage could be followed up the files had been closed again and the formation had advanced so far that the catapults became useless, it being impossible to depress them beyond a certain angle. The front rank had now reached the barrier, and the axes fell furiously upon the wooden leaves of the gate. The Doomsmen on the walls renewed the attack with hand-weapons, the slingers and archers hurling their missiles vertically downward and the spearmen watching their opportunity for an effective body-thrust. The affair would be short and sharp, for the testudo could not be expected to hold its position for longer than a few minutes—it was not in flesh and blood to withstand indefinitely that fierce and deadly shower. Already there were gaps in the protective roof of shields—impossible to repair, for in that close-packed mass the bodies of the wounded and dead impeded the progress of those who would otherwise have taken their places. Yet the struggle went stubbornly on.
A sharp-eyed youth who was lying next to Constans touched him on the arm, directing his attention to a squad of the defenders who were working to dislodge one of the massive coping-stones of the gateway arch. Already it was oscillating under the heave of the levers; if it fell, a score of men might be crushed beneath its weight, and the destruction of the testudo would be a certainty. Constans raised his rifle. It was a long shot, but he could not wait to take deliberate aim; he fired.
The bullet had found its mark, for one man was fallen where he stood and another nursed a broken wrist. The workers at the gate were thrown into confusion and the stone settled back into its bed. The assailants redoubled their efforts, and the thunder of the axe-blows became continuous.