. . "Araballies" . . "more than 30,000 (Arab sources)" . . "Umayyad Caliphate" . . "Sasanian Empire" . "~17,000" . . . "hundreds" . "Rashidun Caliphatevictory" . "Sasanian Empire," . . "Nahr al-Mar'a" . . . "Battle of Nahr al-Mar'a" . "Battle of River" . "Rashidun Caliphate" . . . . "battle of River" . . . . "Battle of River" . .