Dominions 3 does well. A professor of Religio/mythos was one of the developers.
The layout for the battles is that YOU are a pretender god (not a real god) trying to become a God.
So you arent actually AT the battles trying to manage every move of every unit. You can set the formations. And you can recommend very general actions of troops (stand, charge, guard commander, shoot, etc). For commander types you can give more instructions. About 5 of the 50 round combat but that works ok. Like wait/wait/wait/attack-knights or shoot/shoot/shoot retreat-to-rear. For mages and clerics that would be 5 spells then after that they choose for themselves.
So you set it up then send them in to battle. All of those are suggestions from their "god" and taken seriously but they CAN go off script (usually for a reason).
The game has you set the pre-combat instructions, then save your turn. When the turns are all collected then the host processes them. You get back your next turn to watch the battles and see how well you did and plan the next ones. In later games you can take an hour easily setting the actions of all of your armies. That arrangement allows for games where the players are in totally different time zones turning in their turns. Or even for play by using email to send and receive turns.
It also allows for a small game (it can run from a thumbdrive) that can run on almost any computer (windows, mac, linux, really old, and laptop). And it allows the game to support maps bigger than anyone ever plays. And more nations than anyone ever plays (there are over 70 unique ones built in and hundreds more in mods)
Since this is about the battle concept, if Dominions is too much there is always their newer game "Conquest of Elysium 3". Even less management of units. But its faster, more solo play, smaller, and cheaper (Ive seen it available on steam for $2.50). And its small enough to run on a Raspberry Pi ($30 credit card sized computer)