Lunt Roman Fort is a earth and timber fortification.  The fascinating thing is that the timber was prefabricated.  The earth works were created in situ by pioneers and surveyors whilst the walkways, buildings and gateways were prefabricated in Gaul and brought to Britain.

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When the fort was constructed it was built with an attention to detail one can only be astounded at.  The post holes of the gateway had only one centimetre  difference in depth.

In these pictures of the gateway, reconstructed by the British Army (modern) according to an ancient design from Trajans Column, you can see how the structure slots together and then is braced with metal bands.

This allows incredible flexibility in that it can be constructed wherever the Romans have need, the ability for the fortification to be recycled (unlike all those wasteful Welsh castles) and moved to the next theatre of combatas well as being constructed from Elm which is plentiful in Gaul but not so pleantiful in the oak forests of the land which in the distant future will be called England.  Elm is significant because it is incredibly resistant to fire which is a big advantage in a wooden fort.

The significance of this level of planning, organisation and execution.  The Romans were a monolithic organisation which looked to dominating whole areas and brought all the resources, skill and determination together make that happen.