Well, there are a lot of darkspawn here and we're going to be fighting them. Approach the bridge and get ready for a fight. There's a full group of the Legion of the Dead here and they're actually a lot of help. They can handle a lot of the fighting by themselves. Help them finish off the first group and then move onto the bridge. You should probably just put your party on hold and continue luring the darkspawn back to the dwarfs. There are just too many too fight all at once.
Once you've cleared a path to the end of the bridge, you should be able to attack the ogre here. There are ten archers on both sides supporting him. Try to get a good spell, like blizzard, on them to wear them down while you're dealing with the ogre. The ogre itself should be a fairly easy fight. Just surround him with your fighters while the tank shrugs off the damage. The archers themselves shouldn't do too much damage, so just roll them up when you're done.
You should be able to speak to Kardol of the Legion of the Dead now. He'll give you a little background and some news. Once that's done, you can move around to the left side and get to the next group of darkspawn. There are just five of them. The only problem is that the genlock archers will probably run out to the big group around front, and it would be nice to take them down carefully. Try to freeze them if you can.
Follow them out carefully and make sure that no one is running forward stupidly. Stop and attack the bronto and the two darkspawn. Try to have your mage attack the emissary on the steps from a distance. This is the ideal option. If you can land a crushing prison on it, then this fight gets really easy.
Once the emissary and the bronto are down, you shouldn't have trouble mopping up the rest. Kill them and loot the area. Move forward and go into the little side room on the left. There are four archers and two shrieks. Just cut them down and stick close together. Make sure that you grab the Boots of Legion that are in here. Move on out and go to the next side room. There are several corrupted spiders and darkspawn here, along with an emissary. Try to get inside and have your mage do some big crowd control spell. It's really tight quarters, so it will be very destructive. Loot all of the sarcophagi and move into the next section. Be careful, stepping on the pressure plate by the door will trigger the statue to pit fire. This can hurt, so hang back as much as you can until it stops. The darkspawn in here aren't tough. Just make sure that your tank is leading the way and that no one chases running archers. There is another pressure plate up ahead and it launches a fireball. Loot the sarcophagi in here and make sure you get the Gloves of the Legion from the first one by the statue. We need that for the Dead Caste quest.
