Courage in warfare and defense

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا لَقِيتُمُ ٱلَّذِينَ كَفَرُوا۟ زَحْفًا فَلَا تُوَلُّوهُمُ ٱلْأَدْبَارَ

O you who have believed, when you meet those who disbelieve advancing [in battle], do not turn to them your backs [in flight].