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My opinion is that the "rest" period for encounters up to version 1.1.6 inclusive refers specifically to encounters with Heroes or capturing a Castle. Capturing a Lumber Mill (or Ore Pit) should not be included in the definition of the "rest" period for encounters.
And what if you leave a guard there (one warrior of level 1)? Yes, I also think that it would be better to clarify the rules for all these cases.