There was no haste in their movements. They advanced by easy stages, their numbers swelling every day, tribe after tribe joining them, as the news spread of the capture and destruction of the two chief Roman towns, and the defeat and annihilation of one of the legions. So they marched until, a fortnight after the capture of Verulamium, the news arrived that Suetonius, marching with all speed towards the east, had already passed them, gathering up on his way the garrisons of all the fortified posts. Then the great host turned and marched east again. Beric regretted deeply the course that had been taken. Had the garrisons all been attacked and destroyed separately, the army they would have to encounter would have been a little more than half the strength of that which Suetonius would be able to put into the field when he collected all the garrisons. But the Britons troubled themselves in no way. They regarded victory as certain, and expressed exultation that they should crush all the Romans at one blow in the open field, instead of being forced to undertake a number of separate sieges. Still marching easily, they came down upon the valley of the Thames and followed it until they arrived at London. They had expected that Suetonius would give battle before they arrived there. He had indeed passed through the town a few days previously, but had disregarded the prayers of the inhabitants to remain for their protection. He allowed all males who chose to do so to enlist in the ranks and permitted others to accompany the army, but he wished before fighting to be joined by Cerealis and the survivors of his legion, and by the garrisons of other fortified posts. The Britons therefore fell upon London, slaughtered all the inhabitants, and sacked and burned the town. It was calculated that here and in the two Roman cities no less than 80,000 persons had been slain. This accomplished, the great host again set out in search of Suetonius. They were accompanied now by a vast train of wagons and chariots carrying the women and spoil.