Sayyiduna Anas (may Allah be pleased with him) said: In the battles, Sayyidah Umm Sulaym (may Allah be pleased with her) and some other women of the Ansar (may Allah be pleased with them) would be with the Prophet (peace and blessings be upon him); when there was fighting, they would give water to drink and dress the wounds of the injured.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17855