Whilst you have more models on the board than your opponent, friendly Mordor Warrior models gain+1 Courage and may re-roll 1s To Wound when making Strikes.
Bonus of Serpent Horde
A Serpent Horde army mayhave 50% of its warriors armed with bows. Additionally, all Haradrim Warriors and Raiders may apply the Poisoned Weapons special rule to all of their weapons