Re: Muawiyya-why not
Yes there was but read about the circumstances in which it happened
it would be wrong to suggest that Moawiyah ever repented for his actions
The sunni point of view
http://www.al-islami.com/islam/shia_sunni_division_1.php
some quotes from this site
THE CLIMAX OF THE BATTLE
The martyrdom of Hadrat 'Ammar bin Yasir, however, proved that Hadrat Ali (R.A.) was right because of the following Hadith mentioned in Bukhari, Muslim, Tirmidhi and other authentic books of Hadith: According to this Hadith the Holy Prophet (Sallallahu alaihi we Salaam) said, “'Ammar bin Yasir would be killed by a group of rebels.” Since Hadrat 'Ammar (R.A.) was fighting in favour of Hadrat Ali, and was killed by the army of Hadrat Amir Mu’awiyah (R.A.), Hadrat Ali (R.A.) was in the right and his opponents were the rebels
]For seven days the battle continued in this way. A new battalion used to fight from each side under a new commander. On the 8th day the whole army of Hadrat Ali (R.A.) clashed with that of Amir Mu’awiyah (R.A.). A fierce battle was fought but with no end in sight. According to most of the historians, Hadrat 'Ammar bin Yasir was martyred on that day. However no result came out till the evening. The death of Hadrat 'Ammar bin Yasir was a shock to Hadrat Ali (R.A.). The battle went on the whole night. At one time Hadrat Ali reached the tent of Hadrat Mu’awiyah and challenged him to fight personally with him instead of shedding Muslim blood, the winner would be the Khalifah. But Hadrat Mu’awiyah (R.A.)did not accept the challenge because Hadrat Ali was a noted warrior of Arabia
On the second day of the battle Amir Mu’awiyah (R.A.) was about to lose the battle. But, Amir Mu’awiyah was a shrewd person and had been the governor of Syria from Hadrat Umar’s time. He had with him Hadrat Amr bin 'As (R.A.), the conqueror of Egypt and a recognised statesman of Arabia. Seeing the impending defeat he consulted Hadrat 'Amr bin 'As (R.A.) who advised Amir Mu’awiyah to give orders to the troops of the front ranks to fasten the Holy Qur’an to their lances as a sign that war would cease and that the decision would be referred to the Holy Book
Seeing copies of the Holy Qur’an on lances, Hadrat Ali (R.A.) recognised it as a clever move of the enemy but a good many men of his army did not share his view and stopped fighting. Being helpless he ordered his troops to stop fighting
[THE AGREEMENT]
[After the agreement Hadrat Amr bin 'As asked Hadrat Abu Musa Ash’ari to make it public by announcing it in the mosque before the Muslims. Hadrat Abu Musa (R.A.) announced: “We have agreed that neither Ali nor Mu’awiyah would be considered as the Khalifah. You may elect any other man you think fit.” After this Hadrat Amr bin 'As (R.A.) stood up and said, “I do not consider Ali fit for the Khilafat, but in my opinion Mu’awiyah is fit for it.” The statement of Hadrat Amr not only showed the split of opinion between the Arbitrators but also meant one sided decision according to which Hadrat Ali (R.A.) was supposed to lose his power but not Amir Mu’awiyah (R.A.).[
[Hearing the statement of Amr ibn As (R.A.) there was a big uproar. The result of the arbitration was a mere confusion. In this way the arbitration proved to be a futile and the hopes of peace were gone. Both the parties left the place in great disgust. The acceptance of such arbitration, really proved to be disastrous to Ali. Hadrat Ali lost the case before it opened.[
[When Ali (R.A.)heard the result of the arbitration he said, "The judgement is not based upon the Holy Qur’an and the Sunnah which was the condition for arbitration. Therefore it cannot be accepted
Opinion of some Sunnis Ulemas of Moawiyah’s Rule
Maududis view of Muawiyah I :
“Kingship’s foundation began with this change. Mu’awiya (ra) was not appointed with the consensus of the Muslims at large as was the case with his predecessors, if the Muslims were not happy with them they would have not taken the positions, despite this Mu’awiya wanted to be the Khalifa, he fought for this position, the Muslims were not pleased with his appointment. The people did not appoint him, he became by force and when he became Khalifa people had no other choice but to give him bay’a. If the people did not give him baya, they would not only lose their positions / ranks but also would have also lost their lives and would have been catastrophic for the system, people would rather give baya than confront this consequence. That is why after Imam Hasan (ra) stepped down the other Sahaba joined him so as to avoid the risk of civil War amongst Muslims. Mu’awiya was well aware of this strategy”. (citing Al Bidayah wa-Nihayah by Ibn Kathir, vol 8, page 132]) Khilafat wa Mulukiyyat, chapter 5, pages 158-159
Shia views of Muawiyah’s Fighting and cursing Ali(A.S) with sunni references
http://al-islam.org/encyclopedia/chapter5a/1.html