After the Battle of the trench Mohammed sent assassins to kill his chief rival in Mecca, Abu Sufyan.
From the Biography by Al-Tabari:
T1438 Mohammed sent two men to Mecca to kill his rival, Abu Sufyan. The plan was simple and the leader was from Mecca so he knew it well. They set out on one camel for Abu Sufyan’s home where one man would stand watch and the other would go in and put a knife in him.
But the assisting Muslim wanted to go to the Kabah and pray. The leader argued against it because he was well known, but the other Muslim insisted. So they went to the Kabah and sure enough, the leader was recognized. The Meccans set up a cry of alarm and the men fled Mecca. There was no way to kill Abu Sufyan now.
T1439 The Muslims ran to a cave on the outskirts of Mecca. They placed rocks in front of the cave and waited quietly. A Meccan approached the cave while cutting grass for his horse. The Muslim leader came out of the cave and killed him with a knife thrust to the belly.
The man screamed loudly, and his companions came running; however, they were more concerned with their dying comrade than the killers and left carrying the body. The Muslims waited for a while and then fled again.
T1440 On their way back to Medina, the Muslims met a one-eyed shepherd. It turned out that they were related by clan ties. The shepherd said he was not a Muslim nor would he ever be. As they sat talking, the shepherd lay back and went to sleep.
The leader took his bow and drove its tip down through the shepherd’s one eye, into his brain, and out the back of his head. Then they headed on back to Medina.
T1440 On the road, the leader saw two Meccans who were enemies of Islam. He shot one and captured the other and marched him to Medina. When they got to Mohammed with the captive and told him the whole story of the killing, Mohammed laughed so hard they could see his back teeth. Then he blessed them.
In his early days as a prophet in Mecca, Mohammed had not been violent at all. His teachings were religious and confined to threats in the afterlife. By this stage however, his hatred of those who refused to believe in him could be described as inhuman.
His personality is described by psychiatrists as narcissistic. He demanded adoration from others and showed a psychopathic hatred of those who would not give him the status he demanded. At its core, these are the values on which Islam is founded.
Muslims believe that there is no God but Allah and Mohammed is his final Prophet. Mohammed is believed to be perfect and the Koran tells Muslims repeatedly to emulate his behaviour. As we already know, Muslims can choose to follow Mohammed’s Meccan example, as most of them do or follow the Medina example as the Jihadists do. Since earlier verses are abrogated by later ones, the Medinan Koran is better, but since the Koran is perfect the Meccan Koran is also valid.
To a Western mind this is very confusing. By our logic, if two things contradict each other then at least one must be wrong. Western logic is founded on truth and only one thing can be true. In Islamic logic, “truth” is anything which advances Islam. Two things therefore can contradict one another and yet both are “true”.
The confusion this causes is deliberate and Islam often uses it to its own advantage. Its hard (Medinan) side hides behind its softer (Meccan) side. This is one reason why “moderate” Muslims may complain about Jihadists to Kaffirs, but will never confront the Jihadists themselves. They know that the Medina example is the better one.
 The original manuscript of Ibn Ishaq’s biography was lost in the very early days. The Sira was therefore reconstructed from the notes and writings of two of his students, Ibn Hashim and Al-Tabari. This section is therefore taken from “The Sira”