Oh how I wished for centralised detentions at my previous school, where we had to do all of our after school detentions ourselves...!
I am now at a different school with centralised detentions, but today was my first time supervising. I will have to do this once a term from now on.
It was bloody terrifying! I was alone in a room jam packed with the school’s naughtiest boys, ranging from Year 7 to Year 11. I knew none of them, they didn’t know me either. I had zero authority and they knew it. I am just glad I got out of there alive! I burst into tears afterwards 
AIBU or is sending in new staff like this a bit like feeding them to the wolves?