Rashidun Caliphate defeated at the Battle of Nahrawan

What if the Rashidun Caliphate was defeated at the Battle of Nahrawan by the radical Khawarij? If the Khawarijites were able to kill Caliph Ali and seize control of the Muslim Empire, what effect would this have? Would empire decline or expand further?

http://en.wikipedia.org/wiki/Battle_of_Nahrawan

From Wiki: "the Kharijites camped at a village named Harura. They began saying that all Muslims were equal and no one could rule over another, denouncing both Ali ibn Abi Talib and Muawiyah while proclaiming that their belief was in "La Hukma Illa Lillah", meaning, "No Rulership except by Allah alone."

Note:In OTL the Khawarijites actually assassinated Ali later.
 
Hi man,

Depends on how bad the defeat, are we talking about total then Ali will die and there will be civil war. If minimal then there might be tension between the Caliph and he will be able to regroup and get another army
 
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