This was no trifling labor. There was a considerable depth of mud and water to fill, and stones and trunks of trees were brought for the purpose from all the surrounding country, the trees being covered with hides as a protection against fire. The work did not proceed in peace. Hereward and his men contested its progress at every point, attacked the workmen with darts and arrows from the light boats in which they navigated the waters of the fens, and, despite the hides, succeeded in setting fire to the woodwork of the causeway. More than once it had to be rebuilt; more than once it broke down under the weight of the Norman knights and men-at-arms, who crowded upon it in their efforts to reach the island, and many of these eager warriors, weighed down by the burden of their armor, met a dismal death in the mud and water of the marshes.
Hereward fought with his accustomed courage, warlike skill, and incessant vigilance, and gave King William no easy task, despite the strength of his army and the abundance of his resources. But such a contest, against so skilled an enemy as William the Conqueror, and with such disparity of numbers, could have but one termination. Hereward struck so valiant a last blow for England that he won the admiration of his great opponent; but William was not the man to rest content with aught short of victory, and every successful act of defence on the part of the English was met by a new movement of assault. Despite all Hereward's efforts, the causeway slowly but surely moved forward across the fens.
But Hereward's chief danger lay behind rather than before; in the island rather than on the mainland. His accessions of nobles and commons had placed a strong body of men under his command, with whom he might have been able to meet William's approaches by ship and causeway, had not treason laid intrenched in the island itself. With war in his front and treachery in his rear the gallant Wake had a double danger to contend with.
This brings us to a picturesque scene, deftly painted by the old chroniclers. Ely had its abbey, a counterpart of that of Peterborough. Thurston, the abbot, was English-born, as were the monks under his pastoral charge; and long the cowled inmates of the abbey and the armed patriots of the Camp of Refuge dwelt in sweet accord. In the refectory of the abbey monks and warriors sat side by side at table, their converse at meals being doubtless divided between affairs spiritual and affairs temporal, while from walls and roof hung the arms of the warriors, harmoniously mingled with the emblems of the church. It was a picture of the marriage of church and state well worthy of reproduction on canvas.
Yet King William knew how to deal with Abbot Thurston. Lands belonging to the monastery lay beyond the fens, and on these the king laid the rough hand of royal right, as an earnest of what would happen when the monastery itself should fall into his hands. A flutter of terror shook the hearts of the abbot and his family of monks. To them it seemed that the skies were about to fall, and that they would be wise to stand from under.
While the monks of Ely were revolving this threat of disaster in their souls, the tide of assault and defence rolled on. William's causeway pushed its slow length forward through the fens. Hereward assailed it with fire and sword, and harried the king's lands outside by sudden raids. It is said that, like King Alfred before him, he more than once visited the camp of the Normans in disguise, and spied out their ways and means of warfare.
There is a story connected with this warlike enterprise so significant of the times that it must be told. Whether or not William believed Hereward to be an enchanter, he took steps to defeat enchantment, if any existed. An old woman, who had the reputation of being a sorceress, was brought to the royal camp, and her services engaged in the king's cause. A wooden tower was built, and pushed along the causeway in front of the troops, the old woman within it actively dispensing her incantations and calling down the powers of witch-craft upon Hereward's head. Unfortunately for her, Hereward tried against her sorcery of the broomstick the enchantment of the brand, setting fire to the tower and burning it and the sorceress within it. We could scarcely go back to a later date than the eleventh century to find such an absurdity as this possible, but in those days of superstition even such a man as William the Conqueror was capable of it.
How the contest would have ended had treason been absent it is not easy to say. As it was, Abbot Thurston and his monks brought the siege to a sudden and disastrous end. They showed the king a secret way of approach to the island, and William's warriors took the camp of Hereward by surprise. What followed scarcely needs the telling. A fierce and sharp struggle, men falling and dying in scores, William's heavy-armed warriors pressing heavily upon the ranks of the more lightly clad Englishmen, and final defeat and surrender, complete the story of the assault upon Ely.
William had won, but Hereward still defied him. Striking his last blow in defence, the gallant leader, with a small band of chosen followers, cut a lane of blood through the Norman ranks and made his way to a small fleet of ships which he had kept armed and guarded for such an emergency. Sail was set, and down the stream they sped to the open sea, still setting at defiance the power of Norman William.
We have two further lines of story to follow, one of history, the other of romance; one that of the reward of the monks for their treachery, the other that of the later story of Hereward the Wake. Abbot Thurston hastened to make his submission to the king. He and the inmates of the monastery sought the court, then at Warwick, and humbly begged the royal favor and protection. The story goes that William repaid their visit by a journey to Ely, where he entered the minster while the monks, all unconscious of the royal visit, were at their meal in the refectory. The king stood humbly at a distance from the shrine, as not worthy to approach it, but sent a mark of gold to be offered as his tribute upon the altar.