Verse 14

لَا يُقَـٰتِلُونَكُمْ جَمِيعًا إِلَّا فِى قُرًى مُّحَصَّنَةٍ أَوْ مِن وَرَآءِ جُدُرٍۭ بَأْسُهُم بَيْنَهُمْ شَدِيدٌ تَحْسَبُهُمْ جَمِيعًا وَقُلُوبُهُمْ شَتَّىٰ ذَٰلِكَ بِأَنَّهُمْ قَوْمٌ لَّا يَعْقِلُونَ

They will not fight you except in fortified castles, or from behind barriers. Their might looks formidable. You may think that they are united, but their hearts are divided. This is because they are a people who indeed do not use their intelligence.