An issue with this card came up in a game and I thought I'd bring it up here since I was drawn in for a consulting opinion even though I wasn't playing the game.
You play the card on an attacker to force him to decide whether to retreat or not. If he does not retreat he must discard 2 influence and 2 tactics cards. In this particular case, the attacker had the influence but not the tactics cards. So the question was whether the attacker was forced to retreat because he couldn't fully carry out the discards.
I don't remember if this is the game where it specified that if you're given the choice "do A or B" and you can't fully do one of them, you must to the other, but I based my opinion on that assumption. In this particular case, it was not "Retreat or discard ..." it was "Retreat or not. If you don't retreat, then...". So I said the player didn't have to retreat, the defender said he did (that the discard was a "cost" for not retreating), the third player was Switzerland (i.e., neutral) on the subject.
What's the experts' opinions?