Sahih al-Bukhari 2930
Fighting for the Cause of Allah (Jihaad)
Whoever arranged his companions at the time of defeat, and got down from his riding animal and requested Allah for help
Narrated Abu 'Is-haq: A man asked Al-Bara', "O Abu '`Umara! Did you all flee on the day (of the battle) of Hunain?" He replied, "No, by Allah! Allah's Messenger (ﷺ) did not flee, but his young unarmed companions passed by the archers of the tribe of Hawazin and Bani Nasr whose arrows hardly missed a target, and they threw arrows at them hardly missing a shot. So the Muslims retreated towards the Prophet (ﷺ) while he was riding his white mule which was being led by his cousin Abu Sufyan bin Al-Harith bin `Abdul Muttalib. The Prophet (ﷺ) dismounted and invoked Allah for victory; then he said, 'I am the Prophet, without a lie; I am the son of `Abdul Muttalib, and then he arranged his companions in rows."