Shameless plug… I did a conversion of the Tank on Tank WW2 boardgame rules. A bit higher level, but if you like to tinker it is a good set of rules to start with, the rules are available here.
You can find some of my sporadic battle reports here
They are written for hexes like the original, but you could easily use the mechanics for non-hex tables.
I am also a fan of Nordic Weasel’s Brigade Commander and Company Commander. There is also Cold War Commander and Fistful of Tows 3. I have not played either, but have read them and heard good things about them online.
What would you like to command? A company, battalion, or Brigade?
Good luck with your project!