Khawla Bint Al Azwar was the sister of Zaraar bin Malik, both from a tribe of Adnite Arabs that are said to be descendants of the Prophet Ishmael. Her brother was captured in a battle with the Roman Christians, at which point Khawla just goes into battle solo and starts killing Christian soldiers left and right. SHe is a fierce warrior, like her brother. This inspires the Muslims to attack the Romans and rout the enemy. 

After the battle, Khawla refuses to remove her facial covering. Eventually, it is revealed that she is a woman. Everybody celebrates this. When they find out her brother is being taken to a prisoner camp, they plan a daring rescue, Khawla frees him and they escape. 

At the battle of Shakura, the women were captured by Peter and the Romans. The stage they own revolt using tent pegs. Peter's men are actually afraid of them, so they end up releasing them. Zaraar kills Peter for capturing his sister.