Quote Originally Posted by abou
Well, the quincunx just wasn't used anymore. I can't think of any instance in which it was used after the change in the military. In fact, by imperial times the basic formation was reduced from three lines to two - five cohorts in each line. The first line, however, was longer due to the double-sized first cohort deployed on the far right.
Very interesting. I didn't know that.

Thanks for the insight.