Excerpt from De Excidio et Conquestu Britannie
25 So a number of the wretched survivors were caught in the mountains and butchered wholesale. Others, their spirit broken by hunger, went to surrender to the enemy; they were fated to be slaves for ever, if indeed they were not killed straight away, the highest boon. Others made for lands beyond the sea; beneath the swelling sails they loudly wailed, singing a psalm that took the place of a shanty: 'You have given us like sheep for eating and scattered us among the heathen'. Others held out, though not without fear, in their own land, trusting their lives with constant foreboding to the high hills, steep, menacing and fortified, to the densest forests, and to the cliffs of the sea coast.
After a time, when the cruel plunderers had gone home, God gave strength to the survivors. Wretched people fled to them from all directions, as eagerly as bees to the beehive when a storm threatens, and begged whole-heartedly, 'burdening heaven with unnumbered prayers', that they should not be altogether destroyed. Their leader was Ambrosius Aurelianus, a gentleman who, perhaps alone of the Romans, had survived the shock of this notable storm: certainly his parents, who had worn the purple, were slain in it. His descendants in our day have become greatly inferior to their grandfather's excellence. Under him our people regained their strength, and challenged the victors to battle. The Lord assented, and the battle went their way.
26 From then on victory went now to our countrymen, now to their enemies: so that in this people the Lord could make trial (as he tends to) of his latter-day Israel to see whether it loves him or not. This lasted right up till the year of the siege of Badon Hill, pretty well the last defeat of the villains, and certainly not the least. That was the year of my birth; as I know, one month of the forty-fourth year since then has already passed.
See The Battle of Mount Badon page.