Battle of Uḥud

A year after Badr, Quraysh came back three thousand strong. On the slopes of Uḥud north of Madinah the Muslims held the early advantage — until the fifty archers posted on the hill left their position for the spoils, and Khālid ibn al-Walīd (not yet a Muslim) wheeled the cavalry through the gap.

Seventy Muslims were killed, among them Ḥamzah ibn ʿAbd al-Muṭṭalib, the Prophet's ﷺ uncle, whose body was mutilated; the Prophet ﷺ himself was wounded. The Qurʾān devotes a long passage of Āl ʿImrān to the day's lessons on discipline and attachment to spoils.

The sources agree the battle fell on a Saturday in Shawwāl 3 AH; 7 is the majority day, 15 a persistent variant.