Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that in one of the battles of the Messenger of Allah (peace and blessings be upon him), a slain woman was found, so the Messenger of Allah (peace and blessings be upon him) forbade the killing of women and children.
Hadith Referenceالمنتقى ابن الجارود / كتاب الطلاق / 1043