You can earn marks in two ways: * The repeatable PvP quest Hellfire Fortifications (Horde daily) awards three marks for capturing forts in Hellfire Peninsula. Note that as of Patch 2.1.0, this quest can only be done once per 24 hours, but now rewards 150 Thrallmar reputation in addition to the three Marks. * Delivering a killing blow to players of the opposing faction in the vicinity of Outdoor PVP objectives in either Hellfire Peninsula or Zangarmarsh awards one mark to each member of the killer's group or raid.