The readiness of all Israel to assemble upon the complaint of the Levite, seems to say; the Lord had yet a seed to serve him. And no doubt, in the worst of times, this is, and must be the case. There is a sweet promise, to this effect, Isaiah 59:21. Mizpeh, was not far from Shiloh; so that it became a well appointed place, for the collecting Israel together from Dan, the most northern city; and Beersheba, the most southern of all the provinces.
Related Commentaries of Judges 20:1
Judges 20:1-2
1 Then all the children of Israel went out, and the congregation was gathered together as one man, from Dan even to Beersheba, with the land of Gilead, unto the LORD in Mizpeh.
2 And the chief of all the people, even of all the tribes of Israel, presented themselves in the assembly of the people of God, four hundred thousand footmen that drew sword.