In 43 AD the Romans invaded Britain with an occupation army. Julieus Caesar had invaded in 55 and 54 BC but that was an expedition rather than a conquering force. In the year 43 Claudius was emperor and he sent four legions from their port in Boulogne to land in the south of Britain.

• Legio II Augusta
• Legio IX Hispana
• Legio XIV Gemina
• Legio XX Valeria Victrix

 The army of conquest also consisted of auxiliary units of infantry and cavalry, composed overwhelmingly of the Empire’s non-citizen subjects and comprising over 20,000 men