Wis. Stat. § 75.30

No action may be brought by the original owner for the recovery of lands purporting to be conveyed for the nonpayment of taxes by a deed void on its face after the expiration of 5 years from the date of the recording of the tax deed, if the grantee in the tax deed has taken actual possession of the land within 2 years after the recording of the tax deed and has actually and continuously maintained possession of the lands to the end of the 5-year period from the recording of the deed.