They took that which Micah had made, and the priest whom he had, and came to Laish, to a people quiet and secure, and struck them with the edge of the sword; and they burnt the city with fire.
"They had no dealings with any man"  (Judges 18:28).  The citizens of that quiet little city had not made any treaties or alliances with others who might have been able to help them in such a disaster.  "There was no deliverer."