The Pacifism of Islamhttp://www.islamdenouncesterrorism.com/the_pacifism_of_islam.html

…Each time they kindle the fire of war, Allah extinguishes it. They rush about the earth corrupting it. Allah does not love corrupters. (Surat al-Ma'ida: 64)

Permission to fight is given to those who are fought against because they have been wronged - truly God has the power to come to their support - those who were expelled from their homes without any right, merely for saying, 'Our Lord is God'… (Surat al-Hajj: 39-40)

Fight in the Way of God against those who fight you, but do not go beyond the limits. God does not love those who go beyond the limits. (Surat al-Baqara: 190)

...God does not forbid you from being good to those who have not fought you over religion or driven you from your homes, or from being just towards them. God loves those who are just. God merely forbids you from taking as friends those who have fought you over religion and driven you from your homes and who supported your expulsion... (Surat al-Mumtahana: 8-9)

You who believe! Show integrity for the sake of God, bearing witness with justice. Do not let hatred for a people incite you into not being just. Be just. That is closer to heedfulness. Heed God (alone). God is aware of what you do. (Surat al-Ma'ida: 8)

One of these is the British historian, Karen Armstrong, a former nun and a renowned expert on Middle East history. In her book, Holy War, in which she examines the history of the three great divine religions, she comments: 

... The word Islam comes from the same Arabic root as the word peace and the Koran condemns war as an abnormal state of affairs opposed to God's will: "When the enemies of the Muslims kindle a fire for war, Allah extinguishes it. They strive to create disorder in earth, and Allah loves not those who create disorder." (Koran 28:78). Islam does not justify a total aggressive war or extermination, as the Torah does in the first five books of the Bible. A more realistic religion than Christianity, Islam recognizes that war is inevitable and sometimes a positive duty in order to and oppressions and suffering. The Koran teaches that war must be limited and be conducted in as humane a way of possible. Mohammed had to fight not only the Meccans but also the Jewish tribes in the area and Christian tribes in Syria who planned on offensive against him in alliance with the Jews. Yet this did not make Mohammed denounce the People of the Book. His Muslims were forced to defend themselves but they were not fighting a holy war against the religion of their enemies. When Mohammed sent his freedman Zaid against the Christians at the head of a Muslim army, he told them to fight in the cause of God bravely but humanely. They must not molest priests, monks and nuns nor the weak and helpless people who were unable to fight. There must be no massacre of civilians nor should they cut down a single tree nor pull down any building. This was very different from the wars of Joshua. [1]