"What is that strange-looking vessel?" Sweyn asked the Northmen standing round him.

"I know her," one of them said, "for I have twice seen her before to my cost. The first time she chased us hotly at the mouth of the Thames, destroying several of the vessels with which we were sailing in convoy. The next time was in the battle where King Alfred defeated us last year, nearly in the same water. She is a Saxon ship, wondrous fast and well-handled. She did more damage in the battle than any four of her consorts."

"Were it not that I have other game in view," Sweyn said, "we would fight her, for we are two to one and strongly manned, and the Saxon can scarce carry more men than one of our galleys; but she is not likely to be worth the lives she would cost us to capture her; therefore we will e'en let her alone, which will be easy enough, for see that bank of sea-fog rolling up the river; another ten minutes and we shall not see across the deck. Give orders to the other galley to lay in oars till the fog comes, then to make for the left bank of the river and to drift with the tide close inshore. Let none speak a word, and silence be kept until they hear my horn. I will follow the right bank till we reach the mouth."

Freda was standing near and heard these orders with a sinking heart. She had no doubt that Edmund was on board the Saxon ship, and she had looked forward with confidence to be delivered from her captor; but now it seemed that owing to the evil change of the weather the hope was to be frustrated.

Edmund and the Saxons had viewed with consternation the approach of the sea-fog. The instant it enveloped the ship the oars were got out and they rowed in the direction of the Danish vessels, which they hoped would drop anchor when the fog reached them. Not a word was spoken on board the Dragon. Edmund, Egbert, and Siegbert stood on the forecastle intently listening for any sound which would betray the position of the Danes, but not a sound was to be heard. They had, they calculated, already reached the spot where the Dane should have been anchored when from the left, but far away astern, a loud call in a woman's voice was heard.

"That must be Freda!" Edmund exclaimed. "Turn the ship; they have passed us in the fog."

The Dragon's head was turned and she was rowed rapidly in the direction of the voice. No further sound was heard. Presently there was a sudden shock which threw everyone on to the deck. The Dragon had run high on the low muddy bank of the river. The tide was falling; and although for a few minutes the crew tried desperately to push her off they soon found that their efforts were in vain, and it was not until the tide again rose high nine hours later that the Dragon floated. Until morning broke nothing could be done, and even when it did so matters were not mended, for the fog was still dense.

The disappointment of Edmund and Siegbert at the escape of the Danes was extreme. Their plans had been so well laid that when it was found that the Dragon had arrived in time no doubts were entertained of the success of the enterprise, and to be foiled just when Freda seemed within reach was a terrible disappointment.

"My only consolation is," Edmund said as he paced the deck impatiently side by side with Egbert, "that this fog which delays us will also hinder the Danes."

"That may be so or it may not," Egbert answered. "It is evident that some on board the Danish ships must have recognized us, and that they were anxious to escape rather than fight. They draw so little water that they would not be afraid of the sandbanks off the mouth of the river, seeing that even if they strike them they can jump out, lighten the boats, and push them off; and once well out at sea it is probable that they may get clearer weather, for Siegbert tells me that the fog often lies thick at the mouths of these rivers when it is clear enough in the open sea."