Bukhari

Hadith Commentary:

What Anas bin Nadr radi Allahu anhu said meant that he was displeased with both parties: the polytheists are wretched and impure, fighting on falsehood—he is absolutely disassociated from them. As for the Muslims, who should have stood firm and fought on the truth, they fled; he also disapproves of their action and seeks excuse in the Divine Court that he is not among those who fled.

Saying this, he attacked the disbelievers, sending many to Hell, and finally drank from the cup of martyrdom.

By "those who fled" are meant the people who were assigned to guard a mountain pass during the Battle of Uhud, and were emphatically instructed not to leave their post without permission. However, when they saw the Muslims initially victorious, they abandoned the pass, through which the Quraysh disbelievers launched a renewed attack, completely changing the course of the Battle of Uhud. The Battle of Uhud is one of the most painful episodes in Islamic history, in which seventy Muslims were martyred and Islam suffered a tremendous loss.

The "Field of Uhud"—the resting place of the martyrs—is the memorial cemetery of these martyrs of Uhud.

May Allah reward them with the best of rewards. The spring that has now come into the world—all these plants are the result of their planting.

Hadith Commentary:
➊
In the Battle of Uhud, due to a slight mistake by the Muslims, the entire course of the battle changed. Panic spread, and Islam suffered a tremendous loss. Regarding this conduct, Anas bin Nadr (radi Allahu anhu) said that he disliked this action of the Muslims and, O Allah! I seek Your pardon on their behalf. However, the polytheists are fighting against the truth, and I completely disassociate myself from them, but I am not among those who flee. Saying this, he attacked the disbelievers and, after sending many of them to Hell, ultimately himself drank from the cup of martyrdom.
...
radi Allahu anhu
...

➋
In the second hadith, a miracle (karamah) of Anas bin Nadr (radi Allahu anhu) is mentioned, which is narrated here due to his loyalty and self-sacrifice. His intention was not to reject the statement of the Messenger of Allah (sallallahu alayhi wa sallam), but rather to inform about its non-occurrence, which was affirmed by the Messenger of Allah (sallallahu alayhi wa sallam) himself, that Allah fulfills the oaths of His servants. Thus, it happened as such: the hearts of those seeking retribution softened, and they forgave the retribution (qisas) and agreed to accept blood money (diyah).