Great story!
My whole flock did this once, during free ranging. No sign of struggle, I didn't even see a predator. Just all of a sudden the chickens were gone. It took about 15 min to round everyone up, there were babies in bushes, and hens under the camper, and the roo and his favs under...
My funny story is an ongoing saga.
Our very first batch of chicks was an assorted heavy mix. This group had three identical gold fluff balls. It was a while before we were able to tell them apart. All three were pullets. One became the broodiest thing ever, we named her Big Mama, but...