Do you even read and manage to understand before you post a link?CORRECTION:
Why did your "prophet" attack the Jews of Medinah in the first place? Because he was a Self-Seeking MEDDLER. This WIKIPEDIA article helps to explain the mess that Mohammad "solved" by way of EXPULSION AND murder. http://en.wikipedia.org/wiki/Banu_Nadir
Read this but very slowly. This is from the link that you provided:
"When the two Arabian tribes of Aws and Khazraj went to war against each other in the Battle of Bu'ath in 617, the three Jewish tribes split on different sides of the war. The Banu Nadir, led by Ka'b ibn al-Ashraf and Huyayy ibn Akhtab, and the Banu Qurayza fought with the Banu Aus, while the Banu Qaynuqa were allied with the Banu Khazraj. The latter were defeated after a long and arduous battle.
Arrival of Muhammad
Muhammad was invited to Medina to broker a peace between the warring tribes, and in September 622 he arrived with a group of his followers, who were given shelter by members of the indigenous community known as the Ansar.
Amongst his first actions were the construction of the first mosque in Medina, as well as obtaining residence with Abu Ayyub al-Ansari. He then set about the establishment of a pact, known as the Constitution of Medina, between the Muslims, the Ansar, and the various Jewish tribes of Medina  to regulate the matters of governance of the city, as well as the extent and nature of inter-community relations.
The conditions of the pact included boycotting Quraysh, abstinence from "extending any support to them", assistance of one another if attacked by a third party, as well as "defending Medina, in case of a foreign attack".
Reaction to the expulsion of the Banu Qaynuqa
When Prophet Muhammad expelled the Jewish tribe of the Banu Qaynuqa, the Banu Nadir did not get involved, viewing the conflict as another example of tribal struggle. The conflict led to a ruling that such future action by any of the other parties under the Constitution of Medina would constitute a voiding of their benefits under the system.
Learn to read and comprehend. Quote passage from a link, only if you understand.
And don't forget to answer my question:
Why did Jesus call the Jews, Evil?
Was it nice to brand an entire nation, Evil?
What kind of a man would do that?
If he had really called the Jews EVIL, then there is no difference between Jesus, the slanderer and you. Right, Buford?