The legions which invaded Britain in ad 43 under the command of Aulus Plautius were the II Augusta, IX Hispana, XIV Gemina, and XX Valeria. With auxiliaries, the force totalled some 40,000 men. The II Adiutrix replaced the XIV Gemina during a major reorganization of military dispositions in the 60s/70s ad. Each legion was based in a legionary fortress. The II Augusta, for example, was based variously at fortresses in Exeter, Gloucester, and Caerleon.
Extensively excavated forts include those of Hadrian's Wall, notably Birdoswald, Vindolanda, Chesters, and Housesteads. Such research indicates that the Roman army which invaded Britain in ad 43 was very different in structure from that which abandoned the province in ad 410.
"Roman legions." The Oxford Companion to British History. . Encyclopedia.com. (January 23, 2019). https://www.encyclopedia.com/history/encyclopedias-almanacs-transcripts-and-maps/roman-legions
"Roman legions." The Oxford Companion to British History. . Retrieved January 23, 2019 from Encyclopedia.com: https://www.encyclopedia.com/history/encyclopedias-almanacs-transcripts-and-maps/roman-legions
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