There is a story in Islamic history books about prophet Muhammed who sent some of his companions (led by Khalid Ibn Al Waleed) to a village to preach Islam. When those companions told the village people about Islam some of them did not show much interest in it. Therefore, the Muslim leader (Khalid Ibn Al Waleed) killed those people and enslaved some of them. When they returned to prophet Muhammed and told him about what their leader did, prophet Muhammed was not happy and told them he is not responsible or what Khalid did. The funny thing is that prophet Muhammed had never punished that leader for those crimes. Actually, he sent him back in another mission few weeks after that horrible crime. Was not prophet Muhammed supposed to punish that leader who comitted horrible war crimes?