The Hosts of Isengard
The Treason of Saruman#74 (x1)
Quest
3A-B (8)

When Revealed: Search the encounter deck, discard pile, and victory display for Helm's Gate and add it to the staging area. Shuffle the encounter deck. Make Helm's Gate the active location, returning any previous active location to the staging area.

Against the Deeping Wall the hosts of Isengard roared like a sea. Orcs and hillmen swarmed about its feet from end to end. -The Two Towers

Forced: After resolving the quest, if the encounter deck did not place at least 1 progress on this stage as the result of questing, the first player reveals 1 encounter card.

Hundreds of long ladders were lifted up. Many were cast down in ruin, but many more replaced them... –The Two Towers