You will finally head on home now after a hard days work. Atleast what is let of it. Moving on a bit further you'll make your way to the streets to get to the "Wall".
Good thing about this mission is you'll get Goliath back and ready to kick some ***. Start off by removing a few of the RPG teams on the roof at the first part. You shouldn't have to worry too much about them at this very moment atleast until Goliath arrives. Because they will take him out quick so keep your sniper out. You can take easy cover behind the mattress the first house you come up upon on the right side. Very nice cover I might say. Soon enough a Humvee will come smashing thru the barricade.
Thats okay though because Goliath is right around the corner. Take it out immediately and start moving up the street.
David Rejected: Complete the street section without Goliath taking any damage in Chapter 4: The Wall.
Pretty easy to do here. Just be on the lookout for RPG teams on the roofs of the buildings. They come out one at a time so take your time watching out for them all. Moving along. You'll run into a Tank. Run off to the left while Goliath makes a quick escape route. Right thru a house how predictable. You will move around another house, and run into the Tank again. Lock onto him and yet again Goliath while run right thru another house. Who knew this game had a little destruction derby eh?
Going up a bit further you'll come down to the drainage ditch and follow Goliath right along to meet up with some survivors. They will help you on a bit to clear out the barricades. There will be a button in the middle between the two barricades hold it down and wait a few seconds, one down one to go.
Oh look a White Castle :D. Continue there and take some cover. You'll move up to the back and enter the next building and continue off with some slow-motion kills. I don't think they really need this in here..but whatever. Now the last roadblock. Take out a few enemies til you have some decent cover. Go ahead and take out the RPG teams as well. They can be somewhat annoying in this level.
Return back into the building you came from and follow Rianna. Make your way upstairs and you'll find an RPG. A little payback in order? I think so. Sadly though you'll be saying goodbye to Goliath.
Resume back downstairs and enter the Humvee to make your great get-away.
Hope this helps :D