If they look over the wall:
Lit by a large fire in the middle of the courtyard many slaves are hard at work on the keep under the watchful eyes of 3 overseers, neglecting the wall as of now.
If they burst in through the gate:
The 3 very large humans in the courtyard drop their whips and and brandish bloody weapons.
Encounter level: 3 Exp: 525
: Human Berserker x3
Treasure: all items in stat block and 5gp, 12sp, 25cp.