In the rules on page 22, column 1, under "The Ambush Step", is this sentence: "If the current hero is in a Haven location, combat only takes place if the hero allows it."
We've been playing this applies to the "Combat or Peril" step as well. However, rereading the rules today, I see no such restriction. If the heroes did have to fight a minion in a haven during "Combat or Peril", this would make the Sauron plots such as "Loss of an Heir" or "Denethor Falls into Madness" much easier to defend.
How are y'all playing it?
TK