ভূমিকা
Shiavault - a Vault of Shia Islamic Books Nahjul Balagha Part 2, Letters and Sayings Letter 14: To his soldiers before the Battle of Siffin Given to the army before the encounter with the enemy at Siffin [^1] ومن وصيّته (عليه السلام) لعسكره قبل لقاء العدو بصفّين Do not fight them unless they initiate the fighting, because, by the grace of Allah, you are in the right and to leave them till they begin fighting will be another point from your side against them.
If, by the will of Allah, the enemy is defeated then do not kill the runner away, do not strike a helpless person, do not finish off the wounded. Do not inflict pain on women even though they may attack your honour with filthy words and abuse your officers, because they are weak in character, mind and intelligence. We have been ordered to desist from them although they may be unbelievers.
Even in the pre-Islamic (al-jahiliyyah) period if a man struck a woman with a stone or a stick he was rebuked along with his offspring after him.
[^1]: The responsibility for the war and fighting that took place between Amir al-mu'minin and Mu'awiyah lies solely on Mu'awiyah because he brought about the war by laying the wrong blame for 'Uthman's blood on Amir al-mu'minin, although the real facts about the causes of 'Uthman's killing and by whom he was killed were not unknown to him.
But since there was no way for him to achieve his end save by creating an occasion for war, he entered into war to retain his authority which was evidently offensive and which cannot by any means be considered as permissible, because revolt and rebellion against the rightful Imam is unlawful according to the general consensus of Muslims.