For reference:
Again, each square is a 5' square normal for D&D.
Each character is denoted by the first letter of their name.
The red dots are the riders in studded leather armour.
The black dot is the "leader" in the chainshirt.
Each group of red dots has a lit torch between them, no one has any weapons drawn.
The door to the hut is closed by two riders went in there.
The door to the shed is closed, and opens both ways.
The wheat obscures view if you're looking through 10' of it or more, currently not affecting anyone.
The horses are grazing in the grass to the west of the hut, they are not tethered to anything.
The party has a surprise round, one standard action each.
For the purpose of your lying in wait in ambush, you may each have one weapon of your choice out and ready to attack.
Questions?