John Gill Commentary Judges 3:14

"And the children of Israel served Eglon the king of Moab eighteen years." — Judges 3:14 (ASV)

So the children of Israel served Eglon king of Moab eighteen
years .
Ten years longer than they served the king of Mesopotamia, (Judges 3:8) , as a severer correction of them for their relapse into idolatry.