The Roman Period
Still under construction. I would welcome suggestions.
The Glory That Was Rome is a great looking site that seems to focus on military organization and tactics.
End of the Roman Age Society - living history society, based in the UK, dedicated to recreating Late Roman Britain.
Roman Vindolanda and the Roman Army Museum offers information about the museums and the archaeological site Vindolanda, a Roman fort and civilian settlement lying just to the south of Hadrian's Wall.