Why didn't the anglo-saxons conquer the whole GB?

Jaro   Sunday, June 12, 2005, 21:13 GMT
Why did they stop fighting Cornwall, Wales and Scottland? When they arrived the island was inhabited solely by Celtic tribes. They slaughtered the aboriginal population in the land currently known as England and settled there. But for some reason they didn't conquer the whole island and left Cornwall, Wales and Scottland behind which is quite illogical since the Celts were their enemies and could endanger their "England" by invasion later to retake their lost land.

Are there any records of a decisive battle between anglo-saxons and celts which left both tribes incabable of engagement?
Why do you think they stopped?
David   Sunday, June 12, 2005, 21:30 GMT
Your history is totally, totally, wrong. Try doing some reading first.