Which rules for ACW

[Leman]

An interesting big battle set, where the unit is a brigade, is the recently re-released and updated On to Richmond, where who moves when is determined by card draws, each card representing a division. As well as introducing fog of war, it is also a good way of playing solo. Available from Scale Creep as a downloadable book.

[holdfast]

It very much depends upon your playing style. If you feel that you want to be able to control each unit each move then there are rules, which must not be named, which allow you to do this.
In that case, F&F and RF&F are not for you. They are founded on the idea that each unit does not act precisely as desired at that moment by the overall commander. However they do not require a commander to issue written rules at the start and only amend them in accordance with circumstances, but you can do that if you choose.