The Battle of Zafar took place in 632 between Khalid ibn al-Walid, a companion of the Islamic prophet Muhammad, and a tribal chieftess called Salma. Khalid defeated her and she died on the battlefield. The battle was part of the Ridda Wars.
The apostate leader was riding on a camel, surrounded by her loyal bodyguards.
In third week of October 632 CE Khalid ibn al-Walid approached her with a group of mujahideen and slaughtered her and her bodyguards. Several hundred apostates died in this battle.
References
A.I. Akram, The Sword of Allah: Khalid bin al-Waleed, His Life and Campaigns Lahore, 1969 A.I. Akram, The Sword of Allah: Khalid bin al-Waleed, His Life and Campaigns, Nat. Publishing. House, Rawalpindi (1970) .