<human>:  Why did the Anglo Saxons have to fight so much?
<bot>: The Anglo Saxons had to fight because they were constantly being invaded by the Vikings. The Vikings had a very aggressive expansionist policy and they wanted to conquer as much territory as they could. They were particularly interested in the British Isles because they were rich in resources. The Anglo Saxons were a tribe of Germanic people that lived in England and Wales. They were a part of the larger Germanic people group called the Angles and Saxons.