To be a bit more clear, to the left coming through the door there’s a broken wall but that’s not what I mean, over to the right on the back wall there is a bit you climb, has that white paint that indicates you can grab the ledge. Dropping down the other side is a scaffolding, it’s a pain to land on it without rolling off, it’s also a pain to jump through the weak wall after you ard it, I have had to run all the way back around into the garrison a few times.

For the scratched key, off the main courtyard go through a door to a hospital like area where injured soldiers are, the back wall is broken in a spot, climb it and you land on a wooden platform, there’s a weak wall across a gap, Ard it then jump over, you are then in the cell, the key out is on a dead guy, and there’s some supplies near the edge. I think it may be dimeterium ore, so it’s probably worth getting.