Council of Elrond

Knowledge of the enemy wrote:Stolen Knowledge. Playable on an untapped character at a Shadow-hold [ ] or Dark- hold [ ] or if his company faced an agent attack and all of its strikes failed. Tap character. Can be stored at a Haven-only if stored do you receive its marshalling point. If stored, you may discard this card and force one non-unique hazard to be removed from play as you see your opponent discard it through a mechanism of the game

Well, here is the question: Is it mandatory playing this card in the site phase? I mean, items, factions and allies must be played at site phase, but as far as I know, permanent events are played only in accordance with their card text, so... can I play this in Org. phase and avoid facing the auto attack at the site? Or at end-of-turn phase?

It is not mandatory. Note that it can even played during the m/h phase while moving if you face an Agent attack then.

Just as I thought.
Thanks, mate