question: In about 260 AD , what forced the people of Roman towns to find shelter in Roman fortresses ?
answer: raids by the Alamanni tribes
turker_answer: In about 260 AD , raids by the Alamanni tribes forced the people of Roman towns to find shelter in Roman fortresses .
rule-based: In about 260 AD , raids by the Alamanni tribes forced the people of Roman towns to find shelter in Roman fortresses .