This may have been posted elswhere, but if not, the site should give one about all one needs to know regarding Roman Army organization. I've had this info in hardback (anyone remember books?), but no longer have the books. This site seems to be just as complete, and contains most of what is known of the structure and organization. Little has actually survived.
Hope this helps answer some of the questions we've posted.
LO
http://www.roman-empire.net/army/army.html
PS: don't really know how to transfer the address, so you may have to type it or copy/paste. Sorry.
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