Hey Nickle - if you open the gate and leave it open, they should eventually find it and start wandering of their own accord. Most will then return to their favourite roost in the evenings without any trouble. We'd get a run of about 50 or so retired battery hens every so often and they'd start off huddling pathetically in the yard trying to figure out who took away the walls before they'd gradually start to explore their surroundings. It'd take a few weeks but soon they'd be all over the place and scratching around just like regular chooks.