Battle of Adwa/Adowa/Adua "what if" rules to run

[Conquistador]

I am thinking 1)  THW's Colonial Adventures or 2)  Victorian Steel (both of which I own.)

I am not interested in TS&TF at all.  Zero interest.  Zip.  Nada. Never.

Any other rules that you can suggest must be capable of running a multiple brigade battle in 2-3 hours, must be easy to teach to inexperienced players, and must be (that dratted postage thing) easily available in the USA.

What other rules that meet the above criteria should I consider?

[john Hollyoak]

I have to put in a plug for Principles of War. I would certainly be confident of playing Adowa in 3 hours once your are used to the rules and there are lists to cover it. Only problem is that there is no pdf so you are stuck with postage.
John