It is narrated with the same chain that the Messenger of Allah (peace and blessings be upon him) and the polytheists met and fought. When the Messenger of Allah (peace and blessings be upon him) turned back to his camp, the others also turned back to their camp. Among the Companions of the Messenger of Allah (peace and blessings be upon him) was a man who would not leave any lone or straggling man of the enemy without following him and striking him down with his sword. Then the narrator related the rest of the hadith.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5978