6:3-6
The Midianites and various other people groups plundered the crops of the Israelites more or less at will. They similarly plundered the livestock. It was impossible for the Israelites to live a normal existence. Eventually the suffering got so bad that they cried out to the Lord for help. Throughout Judges there is never any hint that Israel repented of their sins. They were only concerned about their suffering, utterly failing to connect their suffering and disobedience together. Our society is much the same today.
6:7-10
They should have been able to work things out for themselves, but seemed unable to do so. Therefore the Lord sent them a prophet. The prophet began by reminding them that it was the Lord who had brought them out of the oppression of Egypt. And it was the Lord who drove out various nations from the Promised Land, and gave it to Israel. He then commands them not to “worship the gods of the amorites”. “But you have not listened to me”. If they had simply read the Law and followed it none of these troubles would have occurred.