Maybe the most essential troops of the Roman army were the soldiers who served in the legions. These legionary soldiers were all Roman citizens and full time professionals. They had signed to be in the army for 25 years. These soldiers were highly trained in infantry warfare, and usually, were skilled in other things.

A Roman legion consisted of about 5,000 foot soldiers. They were more than capable of constructing forts and camps. They also manufactured their own weapons and equipment in addition to building roads.

I think that the life of a legionary soldier was very difficult. Firstly, the problems with recruitment made life hard for a Legionary soldier. Before a soldier could be accepted into the army he had to have an interview (probatio) and also a...