Ibn 'Umar (RAA) narrated that The Messenger of Allah (ﷺ) saw a woman who was killed in one of his expeditions, so he disapproved the killing of women and children. Agreed upon.

وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا; { أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-رَأَى اِمْرَأَةً مَقْتُولَةً فِي بَعْضِ مَغَازِيهِ, فَأَنْكَرَ قَتْلَ اَلنِّسَاءِ وَالصِّبْيَانِ } مُتَّفَقٌ عَلَيْهِ [1]‏ .‏