Steel Armor: Blaze of War

That might be just me, but the graphics look better than it did on the non-Steam version.

For dedicated armored-warfare enthusiasts, however, its emphasis on realistic procedures, combined-arms tactics, persistent operations, and dangerous battlefield encounters provides considerable depth and replayability.

That demanding philosophy creates a steep learning curve, but it also gives successful engagements an unusually satisfying sense of accomplishment.

There is also a Quick Battle generator, where it is fast and easy to set up whatever combat encounter you want, with any mix of forces, on any map area, controlled by you or an AI ally.