Stuck in chapter 3 (The Hill)

[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...