This is a relatively simple (and early, released in the late 80's) fantasy strategy game, where you can choose free battles or a campaign, with two different sides. This particular game was released on the X68000, MSX, and PC-88 as well, in various forms.
Controls use the numpad (turn numlock on) with Enter to select. F12 ends the turn. I'm not sure if the intervening phase is supposed to be an auto-combat where both sides attack each other or I just can't find the command to attack.