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Why would you crate them in the house? I work with a rescue that won't adopt a dog out to someone who intends to crate it at night or leave it outside.
The OPs dogs have been living outside. If a dog has always lived outdoors and isn't used to living in a house, crating will keep it from going to the bathroom and chewing things in the house while you're sleeping, just like with puppies. Dogs from a rescue that have been living in a foster home usually already know these things, so they don't need a crate.
Untrained dogs can benefit from crating when they aren't being watched. I crate puppies or older untrained dogs that are new, whenever I can't watch them. This might be when I'm asleep, in the shower or distracted by cooking dinner.
If the OPs dogs used to live in the house and are already house trained, including knowing that they shouldn't chew on anything in the house that isn't theirs, then they wouldn't need to be crated.