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Ok for solo play then?
Yes basic Impetus is ok for solo, but like I said not as satisfying!
Not sure if they’ve been mentioned, but Commands & Colors are very popular.
Rally Round the King by Two Hour Wargames. It's Fantasy but they released a supplement for historicals with 150 different army lists. It's currently OOP but I think if you ask to Ed who is a very nice guy, he will sell you one rulebook.