I happened to mention the Ermine Street Guard in my last post, as an example, and that reminded me to look at their web site again. There's a lot of good stuff there.

The index of pictures is here. There are 17 albums, arranged under topics. Particularly useful ones might be Equipment 1 and 2 and Artillery 1 and 2, but training and others may come in handy when teaching the Roman army under Roman Britain.

The Ermine Street Guard has been in existence for a long time (they have an obituary of a founding member at present) and they do their research thoroughly, so their equipment is as authentic as possible. In fact, there is an article deploring the lower standards of other, more recent groups (unnamed). 'Gladiator' is dismissed in an aside. (If you visit the linked page, scroll down to "Standards in Roman Re-enactment.")

My one complaint about the site as a teaching aid is the lack of explanation or commentary to go with the fine pictures. In fact, the pictures do not even have an 'alt' tag, which would help, let alone a caption. But if you know enough to make your own commentary, they are a good resource.