"I am afraid of the winter," Beric said, "for then they will be able to traverse the swamps, where now they would sink over their heads." "Unless the frosts are very severe, Beric, the ground will not harden much, for every foot is covered with trees and bushes. As to grain we can do without it, but we shall be able to fetch some at least down from the north. Indeed, it would need ten legions to form a line along both sides of the Fen country right down to the sea and to pen us in completely." By this time the Iceni had become familiar with the channels through the swamps for long distances from their fastness, and had even established a trade with the people lying to the northwest of the Fen country. They learnt that the Romans boasted they had well nigh annihilated the Trinobantes and Iceni; but that towards the other tribes that had taken part in the great rising they had shown more leniency, though some of their principal towns had been destroyed and the inhabitants put to the sword. A month later a fleet of boats laden with Roman soldiers started from Huntingdon and proceeded down the Ouse. Dead silence reigned round them, and although they proceeded nearly to the sea they saw no signs of a foe, and so turning they rowed back to Huntingdon. But in their absence the Iceni had not been idle. The spies from the swamps had discovered when the expedition was preparing to start, and had found too that a strong body of troops was to march along the edges of the swamps in order to cut off the Iceni should they endeavour to make their escape. The alarm had been sounded from post to post, and in accordance with the orders of Beric the whole of the fighting men at once began to move south, some in boats, some in their little coracles, which were able to thread their way through the network of channels. The night after the Romans started, the whole of the fighting force of the Britons was gathered in the southern swamps, and two hours before daybreak issued out. Some five hundred, led by Aska, followed the western bank of the river towards Huntingdon, which had for the time been converted into a Roman city, inhabited by the artisans who had constructed the boats and the settlers who supplied the army; it had been garrisoned by five hundred legionaries, of whom three hundred had gone away in the boats.