He sent to Edmund begging him to proceed at once to Poole, where the king's fleet was ready for sea, and to embark in it with what force he could raise, and to sail and blockade the entrance to the river Exe, and so prevent the Danes from reinforcing their countrymen, while he with his forces laid siege to Exeter.
Edmund would have taken his own vessel, but some time would have been lost, and the king's ships were short of hands.

He was not sorry, indeed, that his men should have some practise at sea, and taking his own band, in which the vacancies which had been caused in the defence of the fort had been filled up, he proceeded to Poole.

Here he embarked his men in one of the ships, and the fleet, comprising twenty vessels, put to sea.
The management of the vessels and their sails was in the hands of experienced sailors, and Edmund's men had no duties to perform except to fight the enemy when they met them.
The news of the siege of Exeter reached the Danes at Wareham, which was their head-quarters, and 120 vessels filled with their troops sailed for the relief of Exeter.
The weather was unpropitious, heavy fogs lay on the water, dissipated occasionally by fierce outbursts of wind.

The Saxon fleet kept the sea.
It was well that for a time the Danish fleet did not appear in sight, for the Saxons, save the sailors, were unaccustomed to the water, and many suffered greatly from the rough motion; and had the Danes appeared for the first week after the fleet put to sea a combat must have been avoided, as the troops were in no condition to fight.
Presently, however, they recovered from their malady and became eager to meet the enemy; Edmund bade his men take part in the working of the ship in order to accustom themselves to the duties of seamen.

The fleet did not keep the sea all the time, returning often to the straits between the Isle of Wight and the mainland, where they lay in shelter, a look-out being kept from the top of the hills, whence a wide sweep of sea could be seen, and where piles of wood were collected by which a signal fire could warn the fleet to put to sea should the enemy's vessels come in sight.
A full month passed and the Saxons began to fear that the Danes might have eluded them, having perhaps been blown out to sea and having made the land again far to the west.