420. When a party condemned to surrender or restore an immovable refuses to do so within the delay prescribed, the plaintiff (or when any person in possession of any immovable sold by judicial sale refuses to deliver it, the purchaser) may obtain a writ of possession to eject him or her, and to be placed in possession.
But no such writ can issue against any party other than the defendant or judgment debtor, who has been in peaceable possession as proprietor for more than a year and a day since the rendering of the judgment, or since the date of the sale, as the case may be.
421. The officer entrusted with the execution of such writ must be accompanied by 2 witnesses, and draw up a minute of his or her proceedings.