It was originally going to be an expansion, but the developers decided to release it as a completely free standalone; it weighs in at a little over 200 megs. It's pretty fun. Theres no singleplayer and it only has 6 maps by default but a level editor was released recently so more maps will be available sooner or later.
Originally posted by Bear
Wacraft, Warcraft, Warcraft, a little more Warcraft (if you can't tell, I really like the expansion)...oh, and a touch of Wolfenstein.
Enlighten me on this enemy territory deal. Until now, I haven't heard of it.