(765 ILCS 130/16)
(from Ch. 54, par. 16)
When a person has made a fence on an inclosure which afterward on
making division lines is found to be on the land of another, and the same
has occurred through mistake, such first person may enter on the land of
the other and remove his fence and material within six months after such
line has been run.
(Source: R.S. 1874, p. 527.)