The Romans arrived in Britain in 55 BC. The Roman Army had been fighting in Gaul (France) and the Britons had been helping the Gauls in an effort to defeat the Romans. The leader of the Roman Army in Gaul, Julius Caesar, decided that he had to teach the Britons a lesson for helping the Gauls – hence his invasion.
They avoid being detected because this would throw off the behavior patterns that exist naturally and they don't want their presence being known since this might throw it off.<span />
