He participated in all the wars of early Islam fought under the command of the Holy Prophet. In all the battles, Ali was the flag bearer of the forces of the Muslims. He was the bravest man among the Muslims. For his unusual bravery he won such titles as "Asad Allah," the lion of God, or "Haidar e Karrar" the warrior whom nobody could match. During his lifetime he killed over a thousand persons of the enemy. In the Battle of Badr alone he killed two dozen persons. He fought over a hundred duels, and in all the duels his adversaries, however strong, were killed. He was the Conqueror of Khyber.