Peace Envoy
You cannot use other battle plans. If your enemy's pawn is at your site, give them one 
per 
in the pool. You're victorious now. Ignore killing warbands.
Q: If I am attacking a player who has Imperial Allies, do I have to give the favor to all of them?
A: Nope. Give the favor to the player you are attacking.
Q: If I don’t have the favor to give, can I still be victorious?
A: Nope. Consider the favor you’re giving them as part of the cost to use the power.
Q: Can I use this when targeting their pawn and favor, thus burning some of the favor I give them?
A: Yes. Also you are a terrible person and I love it.