Orrrr...chain gang them to the border, picking up trash to earn their daily bread and water...they work to complete the wall, ending with them on the south side when finished.
Cost effective, practical, they walked here...they can walk back.
Even better - chain gang them where they are and have them start walking south. They can do all the rest as you said, but I want them cleaning from top to bottom as they leave.
Orrrr...chain gang them to the border, picking up trash to earn their daily bread and water...they work to complete the wall, ending with them on the south side when finished.
Cost effective, practical, they walked here...they can walk back.
Even better - chain gang them where they are and have them start walking south. They can do all the rest as you said, but I want them cleaning from top to bottom as they leave.