legion marching formations

[M. Demetrius]

agmen quadratum was used. Although the term is not very clear it seems quite probable that this was in fact a formation of three parallel columns

Hmm. Wouldn't that be four columns?

a great Ross Cowan book

Hey, no doubt about it. But you hadn't had an opportunity to plug that book in quite some time, eh? Thought I'd let you get back in the limelight by playing the straight man, as it were. It's actually one of my favorite books of its sort. I appreciate your style, sir. :!: