If I can recommend one unsung hero game of the last few years it would be Scourge of War: Waterloo and its DLC. I think most may be put off by the 2D sprites but a game showing this many units in a battle just wouldn’t be possible and run well and I think it looks great still, gives that real life tabletop wargaming feel and the historical accuracy is top notch.
It’s only £10 for the base game and then you can get al the DLC (Quatre Bra, Ligny and Wavre) for £10 together which makes this a bargain. Or the Collector’s Edition for £15!