After all of this he concluded that the attitude required quick peacemaking.
Yazid bin Wahab al-Juhani has given an outline of the Imam’s displeasure with the rogues and mobs from Kufa and of his grumbling of them. He has said: “I came in to him (al-Hasan) when he was stabbed and said to him: ‘O son of Allah’s Apostle, most surely the people are perplexed.’”
The Imam sadly said: “By Allah, I think that Mu’awiya is better for me (than they). They claim that they are my Shia, while they wanted to kill me, plundered my luggage and took my property. By Allah if I took from Mu’awiya a covenant through which I spared my blood and made secure my family and my Shia, it would be better for me than that they would kill me and my family would be lost. If I fought against Mu’awiya, they would seize me by the neck and peacefully hand me over to him. By Allah, if I made peace with him while I was powerful, it would be better for me than that he would kill me and I was a captive, or he would be kind to me, and it would be shame on the Hashimites forever. Mu’awiya and his children would remind the living and the dead from among us of that.”
In his speech the Imam has expressed the treacherous aggression against his life and his dignity. He has shown that he met such an aggression from the hypocrites of his followers. He has shown that they would be so mean that they would kill him or hand him over to Mu’awiya as a captive. And he (Mu’awiya) would kill him or be kind to him, so through that he would record a weak point against the Imam, which would be a disgrace on the Hashimites forever.
After these dangerous events, Imam al-Hasan (a.s) carefully considered the battle against Mu’awiya. He thought of a future full of troubles and disorders which would decide the fearful fate and the inevitable end of both his life and his state, and the life of Islam as well. That is because the few believing members of his army were between the progeny of the great Prophet, may Allah bless him and his family, and the deliverers of the Islamic sacred religion. They were the rest of the companions (of the Prophet) and were of the followers of Imam Ali, the Commander of the faithful, peace be on him. If the battle had destroyed them, the morale, entity, and pillars of Islam would have been destroyed, because it was they who spread its abilities. Besides Islam would make no use of their sacrifices, for Mu’awiya, though his cunning, would regard them as enemies, disobedient to him, and against the general security. Accordingly, he would say that it was necessary for him to put an end to them to save the Muslims’ lives from the riot and disorders.
Indeed perplexity and astonishment appeared during that terrible attitude. To get rid of that deadlock, it was in need of a keen mind and more sacrifices. The Imam thought that the perfect interest required making peace with Mu’awiya, and then he had to destroy the thrones of his state, to explain to the people his (Mu’awiya’a) shortcomings, offences, sins, wickedness, and tyranny. He (a.s) made peace (with Mu’awiya). The peacemaking was necessary. Reason, the Sacred Islamic Law, and the critical attitude required it.
Anyway the extreme pain and misfortunes, from which Imam al-Hasan suffered and made his heart bleed, were that the members of his Army changed up their minds. They changed their opinion and thought and deviated from the truth. They waited for an opportunity (to attack him), wanted to bring about misfortunes to him, plotted against him by night and in broad daylight. They had close relationships with Mu’awiya. They received from him gifts and money. They worked for him as hirelings and spies. They informed him of the secrets, movements, and weak points of the Army. Moreover they spread terrorism and panic, that they might deaden awareness and paralyze the resistance. This wicked phenomenon did not appear at Maskan and in al-Mada’in; rather it appeared after (the Battle) of Siffin. From that day the Army suffered from division and defeat. Al-Baladhiri has said: “When Mu’awiya heard that (Imam) Ali battled against the people (at the Battle of) al-Nahrawan, he wrote letters to the prominent persons with him such as al-Ash‘ath bin Qays and the like. He promised them and made them desire. He spent money on them to the extent that they inclined to him and were slow to go with (Imam) Ali. He (Imam Ali) said, but they paid no attention to his saying. He summoned them, but they did not listen to his summons. Mu’awiya said: ‘I fought Ali after (the Battle of) Siffin without an army and equipment.’”
The treason, perfidy, and breaking of covenant befell the Imam’s Army after the Battle of Siffin. It was this battle that made the people desert Imam al-Hasan (a.s) and forced him to make peace with Mu’awiya.