This small mountain, in front of Mount Uhud, is where the Prophet (ﷺ) had positioned archers during the Battle of Uhud with the strict instructions not to move.
It was the desertion of their posts by many of the archers on thinking the battle was over that led to a reversal of fortune for the Muslims in the war....
70 Muslims were made shaheed in the battle including Hamza (r.a.).
The mountain is also known as Jabal Ainain.