Those not in the habit of reading comments should read the ones on the sketch map post beneath this one. Lots of exchange of information going on there.
While I didn't start out that way, I've found some story growing as I've been making up the forces for these. The majority of the best cavalry seem to have followed Asgar, while the majority of the better infantry seem to have gone with Arnold. This theory is based on the concentration of high-grade heavy cavalry in Asgar's army, and the possibility that the numbering of some of the line regiments represents hasty recruiting to fil in gaps as much of the senior infantry units went to Arnold.
Eventually, these theories will probably spawn more storyline.