Dang. Add this to the list of game ending conditions in 6.2:
* The Peace random event occurs and causes the game to end.
So, treat it like the other non-automatic end game conditions, i.e. resolve existing battles, but do not start new ones, nor resolve any more random events, etc. Then conduct end of game scoring as per p. 21-22.
I'll add this to the Errata & Clarifications post. Sorry about that.
By resolve do you mean continue round by round until draw or a winner? If so do players still get to keep drawing cards and doing things like pulling from reserves?