. . "Battle of the Yarmuk" . . . . . "battle of the Yarmuk" . . . . . . . "Battle of the Yarmuk" . . "Yarmuk" . "15,000\u2013150,000" . . . . "(modern estimates)" . "(primary Arab sources)" . "Battle of Yarmouk" . . . "0636-08-20" . . . . . . . . . . . . . . "1000 killed" . . . . "Byzantine Empire" . "Battle of Yarmuk" . "(primary sources)" . . . . "2000" . "1,390,000" . "Battle of Yarmouk 636" . . "DecisiveRashidun Caliphatevictory" . . . . "Umayyad Caliphate" . . . . . "Ghassanid Kingdom" . . "Tanukhids," . . . "Rashidun Caliphate" . . . . . . . . . . "(primary Roman sources)" . . "100,000\u2013400,000" . "on the Yarmuk River" . . . "2500" .