Kyria nods and gets started. First she takes as much lamp oil as the couple will let her...at least two jugs...and studies the door and the courtyard. Picking a place that's far enough inside that the bandits should all be in by the time they reach it, and that's not too close to anything flammable, she throws some oil down on the ground there. Just enough to mark it.
"This is where we're hoping the bunch up...but if they do it else where, throw your jugs at them wherever they are. They may spread out...try to get as many as you can."
She starts moving boxes and planks around...bringing more up into the courtyard if necessary, from the storage spaces inside the post. In this way she fashions places suitable for people to take cover and hide behind around the sides of the courtyard.
"All right, the two of you who will be guarding the gates, take those two positions. Don't let them see you before they're all in. Stay down, and stay quiet. When you hear the festivities start, get to the gate, close it, and make sure it stays closed."
"The rest of you arrange yourself around the sides as you like. The two here, and there, will have the jugs. Keep an eye on the bandits and throw them at the biggest concentration of them that you can see. Once the fire starts, rush in with weapons drawn and finish them."