‏الفتن وأشراط الساعة‏ : Hadeeth No:6949 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: By Him in Whose Hand is my life, a time would come when the murderer would not know why he has committed the murder, and the victim would not know why he has been killed....

‏الجهاد والسير‏ : Hadeeth No:4320 It is narrated by Ibn 'Umar that a woman was found killed in one of these battles; so the Messenger of Allaah (sallAllaahu alayhi wa sallam) forbade the killing of women and children....