Although the Battle of Nahrawan against the Khawarij wasn’t a big deal and they were easily defeated by Imam Ali’s army, yet strategically, it was a big problem; after this battle, the army of Imam Ali (as) was no longer interested in fighting Muawiyah despite the imam (as) pushing for it as hard as he could. The sudden martyrdom of the imam (as) made matters much worse, and as a result, the uncontested power of Muawiyah was cemented.