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Two thousand years ago the Roman conquest of the British Isles. They were at that time inhabited by Celtic tribes and the Romans were the most developed nation in the world. In 55 BC the Romans invaded the domain of the Celts. Celtic warriors fiercely attacked by aliens, and the Romans came back with nothing. A year later, the Roman troops attacked again and defeated the Celts.
In fact, the British Isles were conquered. The Celts continued to wage war against the Roman troops. To protect their conquest, the Romans had to be placed in a permanent British troops - and they brought in this region their culture. They built roads, bridges, baths and much more. They left in the local language a lot of Latin words. Roman rule ended in 407. The Roman legions were withdrawn from the islands to protect the central province of barbarians, and never went back there.

Answer 1

Я бы так сделал 
Two thousand years ago the Roman conquerors of the British Isles. They at that time was inhabited by Celts and Romans were the most developed country in the world. In 55 BC, the Romans took over the domain of the Celts. Celtic warriors furiously attacked the Romans and the Romans came back with nothing. A year later, the Roman troops attacked again and defeated the Celts.
In fact, the British Islands were conquered. The Celts continued to wage war against the Roman troops. To protect their gains, the Romans had to be located in a permanent British troops - and bring in this region their culture. They built roads, bridges, baths and much more. They spoke the local language lot of Latin words. Roman rule, which ended in 407. The Roman legions were withdrawn from Islands to protect the Central province of barbarians, and never go back.