Its like the third mission, you're going after a fort being used by King Cong's men. There is an open area with heavy gun embankments all over the place. There are also guys with machine guns placed on the hills. You need to destroy the embankments (what I'm calling the covered bunkers) with grenades.

I'm getting killed alot here. I can't seem to take out any of the bunkers permanently with grenades. They have the orange "objective" marker on them. Will I see some kind of visual to show I took out the bunker? Or am I just using grenades or whatever to kill the gunner?

I can't seem to do this mission, and I think I'm playing easy. Any help would be great.