Judges 17-18 discuses the migration of the Danites to the far north of Israel to a town called Laish. (name changed to Dan) Previously they had been allotted a southern area on the coast sandwiched between Ephraim, Judah and Philistine territory.
When did they make this migration?
It was sometime after Deborah because she mentions them on the coast (Jdg. 5:17) Samson’s home town was also ‘down south’ and he was buried there (Jdg. 16:31) so it must have been quite late in the Judges period. What century BC should we reckon?
many years after the death of Moses, and consequently, that Moses could not be the writer of the book of Genesis, where this account of pursuing them unto Dan is given. The place that is called Dan in the Bible was originally a town of the Gentiles called Laish; and when the tribe of Dan seized upon this town, they changed its name to Dan, in commemoration of Dan, who was the father of that tribe, and the great grandson of Abraham.
To establish this in proof, it is necessary to refer from Genesis, to the 18th chapter of the book called the Book of Judges. It is there said (ver. 27) that they (the Danites) came unto Laish to a people that were quiet and secure, and they smote them with the edge of the sword (the Bible is filled with murder), and burned the city with fire; and they built a city (ver. 28), and dwelt therein, and they called the name of the city Dan, after the name of Dan, their father, howbeit the name of the city was Laish at the first.
This account of the Danites taking possession of Laish and changing it to Dan, is placed in the Book of Judges immediately after the death of Sampson. The death of Sampson is said to have happened 1120 years before Christ, and that of Moses 1451 before Christ; and, therefore, according to the historical arrangement, the place was not called Dan till 331 years after the death of Moses.
There is a striking confusion between the historical and the chronological arrangement in the book of Judges. The five last chapters, as they stand in the book, 17, 18, 19, 20, 21, are put chronologically before all the preceding chapters; they are made to be 28 years before the 16th chapter, 266 before the 15th, 245 before the 13th, 195 before the 9th, 90 before the 4th, and 15 years before the 1st chapter. This shows the uncertain and fabulous state of the Bible. According to the chronological arrangement, the taking of Laish and giving it the name of Dan is made to be 20 years after the death of Joshua, who was the successor of Moses; and by the historical order as it stands in the book, it is made to be 306 years after the death of Joshua, and 331 after that of Moses