Many thanks to Jeff Johnson who answered my previous rule question. Of course others have come up.
1) The Assassin card says 'choose one enemy block (not revealed)'. Does this mean: a) The assaassin can not attack any unit laying siege that is face up? - or just b) If not face up the player utilizing the assassin card does not get to see the enemy unit attacked?
2) Do blocks defending in a seige get the Double Defense against the Assassin? If yes do any half hits carry on to a battle round that turn?