After quite a bit of deliberating, I have come to the conclusion that the mass battle system will not be based on a fantasy ruleset. In fact, the concept of having mass fantasy battles is being eclipsed by a desire for 'Imagi-nations' style table-top conflicts. It will not be hard to organize these alt-history battles, as the nations of the Half-Continent are organized and equipped very much like their historical, 18th century counterparts. I would just need a simple way to throw in the oddities like scourges, lahzars, and even the odd nicker or gudgeon.
A set of historical rules is needed. I intend to start by looking at the Free Wargames web site...
Taunton Garrison in the Daily Telegraph
56 minutes ago