Enemy Within: Thus NATO Fought There

It is 1984. Europe stands on the brink of nuclear war. Suddenly, a mystical gate to another world opens on the western fringes of the Iron Curtain. Legions of savage warriors and foul beasts spill forth, but are swiftly repelled by the defending NATO forces. Now, as the Free World strikes back, it appears that the threat is averted... but not all is as it seems.