Stuck in chapter 3 (The Hill)

[marcNOS]

Hi;
I'm in the hill; I've arrived to the cannons, got the grenades and after the scene with the scientist in the bunker there's no more objetives and I don't know where to go or what to do! I need help to continue.
Thanks

[Bloodbuster]

Head back the way you came and use the grenades

[marcNOS]

But, Where do I must use the grenades? against what? I've gone back but I don't find anything to do with the grenades or anywhere to go...

[Bloodbuster]

Go back down through the tunnel, through the door you opened by pulling the lever and move forwards. The first exit on your left is where you came in (and there's a secret out there too...), keep moving past this first exit, and next on your left you will see some stairs leading up. Take out the German soldier, then climb the stairs. Use the grenades at the top...

[marcNOS]

Done! I had not seen the stairs! I think I'm a bit dumb...
Thank U very much!

[Bloodbuster]

Glad you made it