This disaster at once depressed and infuriated the Roman soldiers, while it showed to the general commanding them that the task he had been appointed to perform was vastly more serious than he had expected. Already, as he had traversed mile after mile of the silent river, he had been impressed with the enormous difficulty there would be in penetrating the pathless morasses, extending as he knew in some places thirty or forty miles in width. The proof now afforded of the numbers, determination, and courage of the men lurking there still further impressed him with the gravity of the undertaking. Messengers were at once sent off to Suetonius, who was at Camalodunum, which he was occupied in rebuilding, to inform him of the reverse, and to ask for orders, and the general with five hundred men immediately set out for the camp of Godman. Suetonius at once proceeded to examine for himself the extent of the Fen country, riding with a body of horsemen along the eastern boundary as far as the sea, and then, returning to the camp, followed up the western margin until he again reached the sea. He saw at once that the whole of the Roman army in Britain would be insufficient to guard so extensive a line, and that it would be hopeless to endeavour to starve out men who could at all times make raids over the country around them. The first step to be taken must be to endeavour to circumscribe their limits. Orders were at once sent to the British tribes in south and midlands to send all their available men, and as these arrived they were set to work to clear away by axe and fire the trees and bush on the eastern side of the river Ouse. As soon as the intentions of the Romans were understood, the British camp at the junction of the rivers was abandoned, as with so large a force of workmen the Romans could have made wide roads up to it, and although it might have resisted for some time, it must eventually fall, while the Romans, by sending their flotilla of boats down, could cut off the retreat of the garrison. For two months thirty thousand workmen laboured under the eyes of strong parties of Roman soldiers, and the work of denuding the swamps east of the Ouse was accomplished. Winter had now set in, but the season was a wet one, and although the Romans made repeated attempts to fire the brushwood from the south and west, they failed to do so. Severe frost accompanied by heavy snow set in late, and as soon as the ground was hard enough the Romans entered the swamps near Huntingdon, and began their advance northwards. The Britons were expecting them, and the whole of their fighting force had gathered to oppose them. Beric and Aska set them to work as soon as the Roman army crossed the river and marched north, and as the Romans advanced slowly and carefully through the tangled bushes, they heard a strange confused noise far ahead of them, and after marching for two miles came upon a channel, where the ice had been broken into fragments.