By this time, running rapidly before the wind, the Dragon was approaching the great Roman fort, whose massive walls struck Edmund with astonishment. No one was to be seen moving about in the space inclosed by them. The sail was lowered and the vessel brought to the bank. The anchors were taken ashore and she was soon solidly moored. Then the crew leapt on to the land and ascended the bank to the great level inclosure. The walls were, as Egbert had said, intact--and indeed, except on the side facing the river, remained almost unbroken to the present day. An hour's labour sufficed to block the gateway, where a pair of massive doors were in position, for the place had been defended by the Saxons against the Danes at their first landing on the coast. A few men were placed as sentries on the walls, and, feeling now perfectly safe from any attack on the land side, Edmund and his followers returned on board the Dragon for the night. CHAPTER VIII: THE CRUISE OF THE DRAGON The night passed without alarm. The gale continued to blow with fury, and until it abated Edmund had little fear that the Danes would venture upon an attack. They had indeed no reason for haste. The Saxon vessel was in their waters, and could not return so long as the storm continued to blow from the east. The next day parties of Danes were seen making their way across the swampy country from the direction of Yarmouth. As soon, however, as these approached near enough to see the Saxons in readiness on the walls of the castle they retired at once, knowing that the place could be captured by nothing short of a prolonged and desperate siege. On the fourth day the storm abated, and the Saxons prepared to make their way seaward again. The wind still blew, but lightly, from the same quarter, and the sails would therefore be of no use. With their great oar-power they were confident that, once through the Danish flotilla, they could defy pursuit. Accordingly they again embarked, and loosing their moorings rowed down towards Yarmouth. They had chosen a time when the tide was running in; for although this would hinder their progress it would equally impede their pursuers, while it would enable them to check their vessel in time did they find any unforeseen obstacle in their way. They entered the river and rowed along quietly until they neared the walls of the town. Here the river was at its narrowest, and they saw the Danish galleys gathered thickly in the stream. Edmund and Egbert were on the forecastle, and presently gave the signal for the men to cease rowing. "It is just as I expected," Egbert said; "they have formed a boom across the river of trunks of trees and beams lashed together. We cannot make our way down until that obstacle is removed. What say you Edmund?" "I agree with you," Edmund replied.