Simon put on a Crimean game as a tryout for an interesting set of rules called La Belle Epoque. They are aimed at Army level engagements and the elements are brigades or divisions. They have a particularly interesting approach to artillery as it is factored into the units themselves, rather than appearing as a separate type of element. This solves one of the dilemmas of artillery representation in this level of game as it models the batteries being distributed between the regiments, rather than 70 artillery pieces being shown as one model and a handful of gunners.
the originals are in French but there are translations. The original French isn't too hard to read and there are a few errors in the translation.