The writer is explaining that their ancestors told them of how GOD delivered them. The writer said it was not their bow but it was GOD.
Sometimes GOD doesn’t act when we want Him to and we may think that GOD has left us but He hasn’t. GOD will do it in His timing and He is always on time. He does all things well.
Victory Belongs To Him.
You are my King and my GOD who decrees victories for Jacob.