If they are ex-battery hens they will need special accommodation - they suffer extreme agoraphobia if just placed in a paddock. Their toenails will be overgrown and need clipping, gradually so that the 'quick' retracts until you get them back to normal length. They will not have feathers so will need to be housed indoors in this weather, in a properly weatherproof shed. Access to the outside should be supervised and of short duration until they gain confidence. Sorry, I have been through this process several times, and it does need care and attention - a lot of well-intending people just stick them in the hen-run thinking they will love it, but it is deeply traumatic for them. And no, I have afox over the back fence so am not tempting fate by putting up my hand.
Good luck with them - they will be good layers for at least another 3 years and will continue laying irregularly after that!