Judges 3:2

Overview - Judges 3
The nations which were left to prove Israel.
By communion with them they commit idolatry.
Othniel delivered them from Chushan-rishathaim;
12 Ehud from Eglon;
31 and Shamgar from the Philistines.
Treasury of Scripture Knowledge

Judges 3:2  (King James Version)
Only that the generations of the children of Israel might know, to teach them war, at the least such as before knew nothing thereof;

might know
Genesis 2:17 ; Genesis 3:5 Genesis 3:7 2 Chronicles 12:8 ; Matthew 10:34-39 ; John 16:33 ; 1 Corinthians 9:26 1 Corinthians 9:27
Ephesians 6:11-18 ; 1 Timothy 6:12 ; 2 Timothy 2:3 ; 4:7

to teach
Their fathers fought by a divine power. God taught their hands to war and their fingers to fight, that they might be the instruments of destruction to the wicked nations on whom the curse rested; but now that they had forfeited His favour, they must learn what it is to fight like other men.