Capitan Games will be releasing the American Civil War supplement for their Capitan rules.
From their announcement:
In a few days and coinciding with the 150th anniversary of the starting of the American Civil War we will release in our web the Capitan supplement for the ACW.
You will find totally free 196 unit data cards (96 union / 96 confederate) and a rules supplement.
The Capitan family continues to grow with this supplement, now we have 1,132 different units and 5 campaign / periods to play, and the 6th supplement Capitan Libertadores ( The war for the independence of Sud America the Chilean campaign) will be available in brief, with 112 new unit data cards (52 Royalist & 56 Patriots)