Church Sideyard
After the cutscene, you will be in the sideyard of the church. Smash the barrels and pick up the items, then go out the door. You will be in the same courtyard from which you went in the main doors. A cutscene will play, showing a horde of villagers, obviously unhappy that you have completed your mission. Head out into the graveyard. Ashley will point out a cart full of barrels. Shoot the cart and it will burst into flames and roll down the hill. It will explode and take out most of the villagers. That will make you life much easier. Kill the remaining villagers and head back to the tunnel.
Tunnel
The Merchant now sells a powerful new Handgun named Red9, and a stock for it to help keep it steady. Before you buy it, keep in mind that it takes up quite a lot of inventory space(2x8). There are also new tune-ups available for the Red9, TMP, and the Punisher. Buy what you want, and continue through the tunnel, and break the crate for Handgun ammo. When you get to the ladder, climb up and turn around. Wait until Ashley is away from the ladder, and shoot the hanging lamp for a Spinel. Break the crate in the next room and save.
Pueblo(night)
Compared to previous times, there are very few enemies in the Pueblo, however, they have a higher chance of exposing their parasite, so aim for the torso or other areas to reduce those chances. Walk down the path near the tower, and you'll no doubt hear an enemy announcing to his friends that you're here. You can either head into the two-story house, where the barricade options are available again, or make a stand in one of the nearby huts. Either way, when the enemies stop coming, search every building and climb the tower for items and treasures. When you're done, walk up the path by the tower, knife the bear traps, and exit through the doors.
Farm(night)
Command Ashley to hide in the red container, and head into the nearby hut. Break the barrel, read the document, and save. Exit the hut, and shoot the enemies on the elevated walkway. This will draw out an enemy from the barn, so take care of him, and head for the house. Take care of the two enemies here, knife the bear traps, and climb the ladder. Move along the walkway where the two enemies were, and get the attention of the lone enemy on the ground. When he tries to climb the ladder, shoot him or slice him with the knife to knock him off. Once he's dead, drop down, knife the bear traps, enter the small hut, and break the crate and barrel in here. You can't open the large doors without Ashley, but before you call her over, be sure to search the entire farm for items and treasures. When you're done, call Ashley to have her rejoin you, and piggyback her over the doors so she can unlock them.
Cabin
Sell any treasures you have to the Merchant, and tune up as much as you can. Walk along the bridge to get an unsettling message from Hunnigan, and walk to the end to trigger a cutscene. For fans of the original Dawn of the Dead, this will be a familiar scenario. Push the bookcases in front of the windows, and collect items around the room. The bookcases will buy you some time, but they will eventually break through. Luis lends a hand with his own Red9, and will occasionally throw you some ammo, or a recovery item, so stay close to him. Try to avoid headshots to avoid fighting too many parasites, and use the Shotgun to thin crowds when necessary. Just be careful not to hit Luis-if you shoot him three times, it's Game Over. When Luis says, head upstairs, and knock down the ladders to keep from being overwhelmed. Back into the far end of the room, and use the Shotgun to keep the enemies at bay. If needed throw a Hand Grenade to take out large numbers of enemies, and Flash Grenades to instantly kill any parasites. Once you have killed enough enemies, they give up, ending the battle and the chapter.