The Sahaba and the Battle of Hurnain

A number of famous non-muslims participated in the battle of Hurnain. This is very significant because there's a huge theological controversy can non- muslims be in an army of muslims when they're fighting in Islamic war? In this we learn the humanity of the companions of the prophet Salallahu Aliyu Salaam We also learn the wisdom of the Prophet Salaam in calming down this difference of opinion that existed between the two he just calmed it down.