Manners of War

Allah instructs His faithful servants in the manners of fighting and methods of courage when meeting the enemy in battle,

يَـأَيُّهَا الَّذِينَ ءَامَنُواْ إِذَا لَقِيتُمْ فِئَةً فَاثْبُتُواْ

Moving to verse 46, we see that believers have been prompted to follow a third instruction and that أَطِيعُوا اللَّـهَ وَرَ‌سُولَهُ (obey Allah and His Messenger) - because, help and support from Allah Ta` ala can be expected to come only through obedience to Him. Negligence and disobedience can only be the causes of the displeasure of Allah and a certain deprivation from whatever grace could come from Him. Thus, we have before us three articles of the Qur'anic code of conduct for the battle-field: (1) Firmness (2) Dhikr of Allah (3) Obedience. After that, it was said: وَلَا تَنَازَعُوا فَتَفْشَلُوا وَتَذْهَبَ رِ‌يحُكُمْ ۖ وَاصْبِرُ‌وا (and do not dispute, lest you should show weakness and should lose your predominance, and be patient -46).

Given here is a warning against negative aspects of conduct which must be avoided. As for the negative conduct which impedes successful war effort, it is nothing but mutual difference and disputation. Therefore, it was said: وَلَا تَنَازَعُوا (and do not dispute - 46) for mutual dissension and discord would breed cowardice among them and they would soon lose their image of dominance.