User blog comment:Laquearius/Cú Chulainn vs Fionn mac Cumhaill/@comment-24.229.228.144-20170710025328/@comment-27043000-20170710042629

http://deadliestfiction.wikia.com/wiki/Deadliest_Fiction_Wiki:Battle_Policy

If the battle has happened before in Irish mythology, it's against the policies to do it again.