When the fox wiped out 13 of ours we used our dead chickens to bait the trap... first of all leaving them near the trap and eventually we had 1 in the back compartment. I know it seems weird using them but it felt like their deaths were not completely in vain this way.
I should add that my 8 year old found our decimated flock, not long after her pet lamb was PTS after a dog attack (she actually suffered alopecia from stress bless her!). Eventually a stinky, deer head lured the fox in, he was swiftly and humanely despatched and our current flock live on.
Worst part, I found when you have children , is that feeling of it being our fault and their upset is due to our lack of fencing. Then I felt guilty that our chickens had suffered due to human negligence and then I felt really hacked off that someone was found dumping city foxes on land next to ours and neighbours were feeding the things
To the fox, he is just visiting a supermarket for food for his family I suppose!