- Archaeologists reveal Roman defence system in Scotland
- Structure is believed to be made up of forts, fortlets and watchtowers
- Thought to have been built in AD 70s after Romans invaded Scotland
- Deterred hostile northern Caledonian tribes from invading land
Archaeologists have been carrying out research into a huge late fist century AD defence system, which stretches 120 miles across Scotland.
A total of 14 forts and several fortlets, which formed part of a defensive network built in the AD 70s, have so far been investigated over the past decade by the team, led by Dr Birgitta Hoffmann and Dr David Wolliscroft, both of the University of Liverpool.
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