Micah's idol and civil war with Benjamin
In a time with no king, a man named Micah set up his own shrine, the tribe of Dan stole it, and an outrage at Gibeah led to civil war that nearly wiped out Benjamin.
In those days there was no king in Israel. Everyone did that which was right in his own eyes.
Judges 17:6 (World English Bible)
The last chapters of Judges show how quickly Israel fell apart after Joshua's generation died: private idols, a hired priest, a Levite's concubine abused and murdered, and eleven tribes at war with the twelfth. Four times the writer repeats the refrain below.
These chapters aren't in chronological order with the rest of Judges; they are an appendix showing the spiritual state of the whole period.
Places
JerusalemCanaanBethelBethlehemGibeahShilohMizpahDanJabesh-gileadKiriath-jearimZorahBeth-rehobBaal-tamarMaareh-gebaMahaneh-dan
Dating notes
Ussher places these events right after the elders who outlived Joshua died, in 1413 BC. Judges 20:28 names Phinehas, Aaron's grandson, as priest at the time, which supports an early date. Treat as approximate.