Are the Close Combat games something you'd be interested in, OP? They quite literally have a game mechanic where you fight for each inch of ground within the maps, push further into the map and you get to deploy within those grids the next deployment phase and the battles can last for days at a time with night mechanics and digging in with foxholes in the later titles.
My personal favorite of this series would be Close Combat 5 due to the variety of units/nations and the particular operation it covers (Operation Overlord)
I'd recommend Close combat 2 or 3 if you're more into a tougher AI/grind
There's also Combat Mission but that's a real-time turn-based (you plot out your moves then hit play and watch the turn play out) I can't recommend the latest iterations of that series, but I do highly recommend the older titles as they have infantry that's a bit more believable and overall the titles are much better in terms of scale and setting. Again if you play a large scenario the battles can last days across hundreds of kilometers and honestly some of those missions/"operations" overwhelmed me in my youth and I don't think in my older more mellowed age I'd fare much better. Losing units also really hurts in these game modes because if you lose a platoon of infantry or a single tank it can affect the rest of the entire battle.
My personal favorite for these was Barbarossa to Berlin, though the Overlord and Afrika titles were also very solid.