Cope's Defense Mod (CDM) is a work-in-progress modification for Dawn of War II. The newest version is 0.5. The goal in CDM is to survive as long as possible against the waves of enemies (currently 40 waves, more to come) with the Space Marine squads (scouts, Tactical Marines, Assault Marines, Heavy Bolter, Apothecary and Techmarine, Force Commander) you receive in the beginning. You can upgrade your squads to be stronger and more effective. Still WIP but you can already download a playable version (which actually is lots of fun).
You will hardly be ale to recognize on which map this screenshot has been taken, 'cause in the coming version of CDM you'll be able to choose from different atmosphere-presets to change the weather and overall atmosphere.