Fourteen forts were ultimately placed around 7 1/3 miles apart, with milecastles (small forts) every Roman mile, and turrets (watch towers) every 1/3 mile. Initially no forts were part of the plan, but as with any big project changes were made to the scheme along the way. The soldiers left their mark by engraving stones built into the structure (called centurial stones), noting which sections they had built. The main phase of building took six years, but work on the forts may have taken another 10 years. It was built by the army of Britain, with the three legions (citizen troops) providing the bulk of the building force. Scholars today think that it was part-defensive structure, part-propaganda statement, and part-tax barrier (extracting taxes on goods moving in and out of the empire).
The construction of Hadrian’s Wall began in AD 122, and there are many theories as to why this huge project was undertaken.
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