While Elfhelm is ready, he gains:

Response: After your threat is raised as the result of questing unsuccessfully, or by an encounter or quest card effect, reduce your threat by 1.

"But my lord sends word that we must set ourselves in readiness: orders may come for a sudden move." –The Return of the King

Action: Spend 1 resource from a Rohan hero's resource pool to put Elfhelm into play from your hand under your control. At the end of the phase, discard Elfhelm if he is still in play.

"...my lord sends word that we must set ourselves in readiness; orders may come for a sudden move."
–The Return of the King

Each hero with an attached Mount gets +1

Each hero with an attached Mount gets +1

Each hero with an attached Mount gets +1

Ahead nearer the walls Elfhelm's men were among the siege–engines, hewing, slaying, driving their foes into the fire–pits.
–The Return of the King

Each hero with an attached Mount gets +1

Each hero with an attached Mount gets +1

Each hero with an attached Mount gets +1

Ahead nearer the walls Elfhelm's men were among the siege–engines, hewing, slaying, driving their foes into the fire–pits.
–The Return of the King