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The first Celtic tribes (arrive) about six centuries before the Romans (invade) the country.These tribes (even like) there for more than 1000 years when the Angles and the Saxons (begin) to settle in Britain in about 400 AD. After the Celts (lose) several terrible battles against the Angels and Saxons, they (escape) to the hills of Cornwall, Scotland and Wales.
Before the Angels and Saxons (come) to Britain, they (live) in what is today Denmark and Northern Germany. The Angels and Saxons (be able) to settle in Britain quite easily because the Roman army (already leave) Britain. For the Celts life under the Angles and Saxons (not be) as peaceful as it (be) under the Romans.