It is narrated from Sayyidah Umm Sulaym (may Allah be pleased with her); she said: "The Messenger of Allah (peace and blessings be upon him) used to take us, a few women of the Ansar, with him on military expeditions, and we would give water to the sick and treat the wounded."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21764