The Qur’an on Battle Tactics
In Surah Nisaa, Allah says:
يَا أَيُّهَا الَّذِينَ آمَنُواْ خُذُواْ حِذْرَكُمْ فَانفِرُواْ ثُبَاتٍ أَوِ انفِرُواْ جَمِيعًا Translation: O ye who believe! Take your precautions, and either go forth in parties or go forth all together (Surah Nisaa, 4:71).1
The message: prepare, and fight in groups.
A related incident: after the battle of Uhud, many tribes targeted the Muslims to take them down once and for all. The day the Prophet (صلي الله عليه وسلم) returned from battle, he slept, prayed ‘Isha (alone), and the next day, after Fajr, said “we’re going after [the fleeing army].