So far, I found that there are 2 Guards. When you have the Main Guard Distracted, you can move inward, you will come to a guard with a torch, hide on the right side of the big rock in the middle area, wait until the guard walks back and then forth to his main standing place, as he walks back, slowly move around to the back of him and press the button required to quitely kill or knock them out. When you approach the guard by the door, you have a small window of opportunity to rush towards him and knock him out.
The door he is guarding is locked, you must climb the ridge to your right to get past the wall. (There are two ridges). Once you're on the other side, there are 3 or 4 guards to knock out. There's only two objects of note here: First, climb up to the window to eavesdrop Sile and Loredo, and second, a couple of boxes fit for looting behind a unlocked door. Knock the guards out before completing these objectives so you don't accidentally trigger a cutscene.