Wis. Stat. § 75.30: Action by original owner if deed is void, when barred.

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.