Judges 8:30

And Gideon had threescore and ten sons of his body begotten: for he had many wives.

The notice of Gideon's seventy sons belongs to the history of Gideon as judge and deliverer of Israel. God raised him up for that work when Midianite oppression pressed the nation. That oppression followed Israel's sin, and deliverance came after the people acknowledged their wrongs and turned to seek help.