If you were brought up in the world before PCs and/or played strategy board games when you were a teenager then you may well like the free version of winspww2. This is very similar in play to the old Avalon Hill board game Panzer Leader, but updated to the computer age. You play against the computer, but if you want to roll your own scenario with the game designer (you will have to search for this) you can set up computer vs computer games in your own terrain, and (im)balanced order of battle.
The nature of this turn-based game means it is not fast playing, but if you are an armchair corps commander/tactician then this could be your game to pass half an afternoon. Great for those whose reaction speed has slowed!
There are additional scenarios available on line, but I’m afraid you will have to search for them as I cannot remember their locations.
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Steve’s keyboard is the one in the middle. 
