Glad you asked...
Mostly all chickens are night blind so they perch in a tree or somewhere off the ground and stay put for the night. So at night you can catch these animals fairly easily. All you will have to do is locate them and pick them up and put them in a cage for relocation.
Then again, this answer might help you...
You could try putting up a fence that may keep the chickens out. A dog could also be effective in scaring the chickens out of your yard, but be sure they are not harmed in the process.

