Read and reflect on verse 5140 from Surah Al-Hashr: Never will they fight you, [even] in unison, otherwise than from within fortified strongholds or from behind walls. Severe is their warlike discord am...
لَا يُقَاتِلُونَكُمْ جَمِيعًا إِلَّا فِي قُرًى مُحَصَّنَةٍ أَوْ مِنْ وَرَاءِ جُدُرٍ ۚ بَأْسُهُمْ بَيْنَهُمْ شَدِيدٌ ۚ تَحْسَبُهُمْ جَمِيعًا وَقُلُوبُهُمْ شَتَّىٰ ۚ ذَٰلِكَ بِأَنَّهُمْ قَوْمٌ لَا يَعْقِلُونَ
Never will they fight you, [even] in unison, otherwise than from within fortified strongholds or from behind walls. Severe is their warlike discord among themselves: thou wouldst think that they are united, whereas [in fact] their hearts are at odds [with one another]: this, because they are people who will not use their reason.