It was a time when a civilization that had survived for 350 years suddenly collapsed, almost overnight. Trade, government, education and the rule of law ceased. This was Britain at the beginning of the fifth century. Roman legions left to fight the Emperor's wars in Europe and raiders invaded Britain, devastating the land, burning crops, slaughtering young and old alike and taking the rest as slaves. Retired soldiers and their families find safety in an old cavalry fort after their farms have been destroyed. They take in refugees including a village elder and a brewer and his daughter...