You're the commander of the allied forces at Operation Market Garden. You can play as either the Germans or the Allies. You play on the battlefield in real-time. The battlefield is bloody and realistic, with scary screams of man down as you watch a man get his head blown off, (the games played in a topdown view,) and the ratta-tat-tat of the German machine-guns. Real machine gun sounds.
The Close Combat series have always been realistic because of the AI. Your men will run away if the Germans do a rush or something like that, and they'll be unresponsive if you make them do something stupid (like rushing tanks), and if they start to move into gunfire, under your command of course, they'll go back to the start, or away from the enemy.