I have always preached a layered defense.

Motion light, dogs, unfriendly vegetation (thorny bushes, roses,) Motion cameras and then household stuff.

If someone is doing bad things in the front, they are caught on camera(live) and probably bathed in a spot light.

If they are in the back they have messed up. Motion spotlights, a high fence and 3 dogs. A few pretty sketchy chickens as well.