The Battle of Carn Dûm

Basic strategy is same as Seastan's as described:

https://ringsdb.com/decklist/view/5756/minimum-purchase-the-battle-of-carn-dm-1.0

The key is to build AN ARMY OF SUPER DEFENDERS as below to survive the battlefiled, then counter attack hardly:

Erkenbrand with Armored Destrier + Hauberk of Mail + Dúnedain Warning

Amarthiúl with Armored Destrier + Warrior Sword + Heir of Valandil

Elrond with A Burning Brand + Steward of Gondor + Gondorian Shield + Unexpected Courage

Treebeard + Unexpected Courage + Ent Draught

Arwen Undómiel + Warden of Healing + Derndingle Warrior also are all nice allies to help you survive.