That is cheating

Heavily fortified defensive barrier
Antonine wall - second wall built further into the frontier in Britain
Defensive Barrier with forts & signal towers
Roman built - by the very soldiers that guarded it
Immigration & Invasion Control
Aulus Platorius Nepos - governor that initiated some changes to wall
Northern England
Squared stone - items used to make a large portion of wall
Warriors - both those who built the wall and those whose passage it blocked
Antoninus Pius, emperor after Hadrian, essentially abandoned the wall and began building a new wall further north, called the Antonine Wall
Labored by Roman soldiers
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