Attach to an ally.
Attached ally does not exhaust to quest.
–The Hobbit
Attach to the active location. Limit 1 per location.
Attached location gets +2 quest points.
Response: After attached location is explored, discard cards from the encounter deck until a location is discarded. Add that location to the staging area to choose an non-unique enemy in the staging area and shuffle it into the encounter deck.
Play Ambush into the staging area unattached. If unattached, attach Ambush to the next eligible enemy that enters the staging area.
Combat Action: The engaged player discards Ambush to declare an attack against the attached enemy.
"But we have a new errand on this journey: we come to ambush the Men of Harad." –Mablung, The Two Towers
Setup: Attach to the Ring-bearer.
Forced: At the end of the planning phase, either raise each player's threat by 1, or exhaust the Ring-bearer.
"It's heavy on me, Sam lad, very heavy. I wonder how far I can carry it?"
-Frodo Baggins, The Two Towers
Attach to a Hobbit hero. Limit 2 copies of Friend of Friends in play.
While another hero has Friend of Friends attached, attached hero gets +1 
+1 
+1 
and +1 hit point.
"Come, Mr. Frodo!" he cried, "I can't carry it for you, but I can carry you and it as well"
–Sam Gamgee, The Return of the King