What does Judges 18:11 mean?

When Israel came into the Promised Land, the tribe of Dan was allotted territory (Numbers 3:5–10). However, they failed to complete their conquest (Judges 1:34–36). During the era of the judges (Judges 2:16–19), the tribe has come to feel overcrowded (Judges 18:1). They have sent scouts—five "spies"— to find a new homeland. Those men returned and made their report. Their strong and urgent recommendation to the people was to migrate north 100 miles, or about 160 kilometers. They could obtain land by attacking a group of peaceful, unprepared Sidonians living in a town called Laish.

The spies have pushed hard to convince the entire tribe that defeating the inhabitants would be easy and the land was perfect for them. Yet only a portion of the people appear willing to go. A group of six hundred men, armed for battle, set out along with their families. They leave the struggling Danite towns of Zorah and Eshtaol to begin the migration. Laish is in the far northern edge of the Promised Land, beyond the northern end of the Sea of Galilee, at the foot of Mount Hermon.