Another close-up look at the process of archaeological discovery - at Ribchester, Lancashire, a site which, for the first 100 years of Roman rule in Britain, was part of the northern frontier, an inhospitable location where all that separated the invaders from the hostile tribesmen were ditches and forts.

Working against the clock, the Time Team reveal by excavation a unique piece of military engineering that holds the key to just how the Roman army survived - around AD100 - in this remote outpost of the Empire.

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