At the northern limit of the Roman Empire was Britain. Soldiers and their families found it to be a cold, remote, hostile place with little to do. Like soldiers ever since, they spent much of their free time writing letters home, asking for news and warm clothing. (from pbs.org) Image from Wikimedia Commons
See how the Roman Empire grew and changed over time.
Select the MIDDLE level.
Search the keyword ARMY then select ANCIENT WORLD and read the section on Rome.
The Aurealian walls of Rome One of the many Roman walls built to protect the city from enemies. Image is Public Domain.
High command structure of the East Roman Army AD 395 (Public domain)