ٱلَّذِينَ قَالَ لَهُمُ ٱلنَّاسُ إِنَّ ٱلنَّاسَ قَدْ جَمَعُوا لَكُمْ فَٱخْشَوْهُمْ فَزَادَهُمْ إِيمَٰنًا وَقَالُوا حَسْبُنَا ٱللَّهُ وَنِعْمَ ٱلْوَكِيلُ

The battle of Uhud took place at a distance of two miles from Madinah. After the battle, the enemy, led by Abu Sufyan, marched back and camped at a place called Hamra-ul-Asad, at a distance of eight miles from Madinah. After having camped there, it occurred to those who denied the truth that they had made a great mistake in leaving Uhud, as it was there that they had the best opportunity to pursue the Muslims as far as Madinah and crush their power forever. In the meantime, they met a trader’s caravan belonging to the tribe of Abdul Qays, going on to Madinah. They gave the people of the caravan some money and induced them to spread rumours in Madinah that would strike terror into the hearts of the Muslims. When they reached Madinah, they started saying that they had seen themselves that the Makkans were gathering a large force and intended to attack Madinah once again. However, the Muslims’ total trust in God was a guarantee that the planning of the enemies would prove counter-productive. The rumour about the Makkans actually benefited the Muslims, as they were now forewarned of their enemies’ intentions. Consequently, the Prophet along with his companions immediately marched towards Hamra-ul-Asad, prior to the Makkan army advancing on Madinah. When the Makkans learnt that the Muslim force was advancing towards them, they thought that the Muslims had mustered fresh forces. They immediately fled to Makkah, giving up all thoughts of attacking Madinah again.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (3:173)