Verse 20

أَمَّنْ هَـٰذَا ٱلَّذِى هُوَ جُندٌ لَّكُمْ يَنصُرُكُم مِّن دُونِ ٱلرَّحْمَـٰنِ إِنِ ٱلْكَـٰفِرُونَ إِلَّا فِى غُرُورٍ

Who is going to provide an army to protect you besides The All Gracious?  Indeed the unfaithful are taken by an illusion.