Judges 3:2-4

2only that the generations of the children of Israel might know war by learning it, at the least those who before had known nothing thereof:

3five lord ships of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites that dwell on mount Lebanon; from mount Baal-Hermon unto the entering into Hamath.

4And they were to prove Israel by them, to know whether they would obey the commandments of Jehovah, which he commanded their fathers by the hand of Moses.