The word "Islam" is closely related to the word "salam or silm" which means peace. Muhammad(pbuh), himself had a very peaceful nature, was extremely tolerant, and highly protective of the non-Muslim minorities living in the Muslim state. However, there are times when states find war inevitable, but Islam only permits war in specific and dire circumstances. It keeps warfare at a level of mercy and respect for the enemy that no other army has been able to reach. The Prophet sometimes had to fight for the mere survival of his people and message, but once their security was ensured, he immediately reverted to peace and diplomacy.
The conditions placed upon the soldier in battle are of utmost respect for the enemy and for human life. Islam makes a clear distinction between combatants and noncombatants, forbidding soldiers to harm defenseless civilian in any way. The Prophet said: "Do not kill the women, children, aged or the ill." He also prohibited Muslims from harming monks in their monasteries or hermits in their caves. Cutting down trees, destroying livestock, wells, homes or land of the enemy is likewise forbidden. Upon seeing the corpse of a woman in a battlefield, Prophet Muhammad asked his companions why she had been killed, and condemned it. There is no excuse for any expedition or attack resulting in the killing of civilians, no one has the right to take innocent lives.
The extent of the Prophet's mercy can be seen in the Muslim conquest of Makkah, which happened towards the end of his life. The Makkan tribe of Quraish had blatantly violated the significant "Treaty of Hudaybiyya" by supplying men and arms in an effort to attack a Muslim-allied tribe. They had slaughtered ruthlessly, even killing inside the Holy Sanctuary, and knew they could expect retaliation for such a weighty crime. Muhammad, upon learning of the raid, set out for Makkah at the head of a colossal army of 10,000 men. Everyone wondered how he would conduct this expedition; if he wanted revenge for all the mockery, persecution, and murders of his companions, now was certainly the time. His forces humiliatingly outnumbered his enemies.
When the army reached the outskirts of Makkah, they came upon the chief of Quraish, the archenemy of Islam, Abu Sufvan. Several Muslims were furious and wished to see him dead, but the noble Prophet received him. Muhammad asked his uncle, Abbas, to take Abu Sufyan ahead to a high gorge-giving him a full view of the Muslim army approaching Makkah. The leader must have felt his heart leap to his throat as he watched group after group, tribe after tribe pass in front of him. Finally, he turned to 'Abbas and asked incredulously, "Oh Abbas! Who are all these people?" Abbas's reply was plain and powerful: "This is the Apostle of Allah and his Companions."
When Abu Sufyan approached the Prophet Muhammad begging for pardon and forgiveness, it was not revenge he heard coming from Muhammad's blessed lips. Instead, the Prophet simply said: "He who takes refuge in Abu Sufyan's house is safe; whosoever confines himself to his house, the people therein will be in safety; and he who enters the Sacred Mosque is safe." With these words Muhammad gave a full pardon and amnesty to the city of Makkah, and it was conquered in peace. To Wahshi, the murderer of Muhammad's uncle Hamzah; a pardon. To Hind, who mutilated his body and chewed his liver, absolute clemency. To Habar, who had attacked the Prophet's daughter so brutally that she eventually died, forgiveness.
After seeing this, the people started to accept Islam in crowds, as long before, God had promised Muhammad they would. " When comes the Help of Allah (to you against your enemies) and conquest (of Makkah), And you see that the people enter Allah's Religion (Islam) in crowds, So glorify the Praises of your Lord, and ask for His forgiveness. Verily, He is the One Who accepts the repentance and forgives"The Holy Qur'an, Chapter 110,Verse 1-3.
As families were reunited and the Muslims celebrated being back in the sacred city, Muhammad had other things in mind. After offering prayers to God for the victory, he proceeded directly to the House of God, the Ka'bah, that had been polluted by the 360 man-made idols. The Prophet of God proceeded to knock them to the ground with his bow. As he did, he recited the Qur'anic verse: "And Say: Truth (Islamic Monotheism) has come and falsehood (Polythesm) has vanished. Surely! Falsehood is ever-bound to vanish."The Holy Qur'an,Chapter 17,Verse 81.