What does the reference to Israel's doing evil signal?
Judges 3:12 (ESV)
12And the people of Israel again did what was evil in the sight of the LORD, and the LORD strengthened Eglon the king of Moab against Israel, because they had done what was evil in the sight of the LORD.
This reference marks the beginning of the second cycle within the main section of the book.
12 And the people of Israel again did what was evil in the sight of the LORD, and the LORD strengthened Eglon the king of Moab against Israel, because they had done what was evil in the sight of the LORD.