The entrance to Fort Drakon is full of more enemies. I had a lot of fun calling up the golems, since they kinda crushed everything for me in a few seconds. It's your decision though. There are a few ogres and some emissaries. If you've made it this far, you really shouldn't have any problems. The worst part is that there are a few barricades protecting the archers, so your warrior will need to knock those down and clear the way. Other than that, just break right through.
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The first floor actually shouldn't have too many enemies. You've also already been here for the “Captured!” quest, so you should know the lay of the land. There are only two real issues. The first should be a bit of an ambush by the room with all the ballista towers. A darkspawn conjurer will call up a few shades and shrieks and then move about the room. I didn't really have any problem with this. Make sure your mage focuses on dealing out some damage while your main group holds back his summons. He's still just a mage, so he'll die pretty quick.
The only other problem is a little hard to describe location wise. As you leave the main halls, you'll find a door that leads to a really narrow corridor linking the prison and staircase areas. This corridor is a huge trap. There's a grease trap in the center and emissaries and alphas on each side. If you just storm in, you'll get ripped apart. Send your rogue in to disarm the trap and lure out one of the groups. Lead them back to your party and take them out. It's pretty easy to do if you aren't covered in grease or facing two groups at once.
Kill the other ambusher and then take the path to the left. This staircase will take us to the second floor.
