message: Minor units are only expelled to passable tiles before the birth of a civ
diff: @@ -547,7 +547,7 @@ class Birth(object):
  def removeMinors(self):
  cities = self.area.cities()
  - edge = self.area.expand(1).edge().where_surrounding(lambda p: not p.isCity())
  + edge = self.area.expand(1).edge().where_surrounding(lambda p: not p.isCity()).passable()
  for unit in self.area.units().minor():
  if cities.owner(unit):
  