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.
"And they called the name of the city Dan"  (Judges 18:29).  They built their city on the ruins of the destroyed Laish.  Note that Dan is referred to here as "their father," meaning their "ancestor."  The proverbial expression, "From Dan to Beersheba," carried the meaning of, "from one end of Israel to the other."