I let them out when it was getting dark, because they killed to turkey poults
If they were let out when it was getting dark, they may not have had a chance to find a suitable tree to roost in and if they spent the night on the ground chances are not good that they survived. I pen mine, but will let them out to roam sometimes, but always herd them back in at night. The last time one decided she wasn't going in at night all I found the next day was a pile of feathers.