On the Roman Empire Fleet

The Roman Empire Fleet got sprouted in the Punci War,grown up in the Civil War,and formally established in the reign of Augustus.Army group was the basic organization form,whose soldiers were recruited from freemen and non-natives.Up to the mid-year of the first-century,it had ten regular fleets stationed in the frontiers.This Empire Fleet was the major power of frontier defensive system,which played an important role in supporting the legion in the overseas crusade.During the peace time,the Fleet was a sharp sword for pirates,safeguarding the traffic of the empire over the sea.Ever since the 3rd century,with the decline of Roman Empire,the combat effectiveness of the Fleet deteriorated and its sea defensive system almost collapsed.At last,as the pirate rose up again,the barbarians took up the advantage and started the infringing attack on the empire.