Abu Hazim (may Allah have mercy on him) relates that the people differed over what the wound of the Messenger of Allah (peace and blessings be upon him) was treated with on the day of Uhud. So they asked Sayyiduna Sahl (may Allah be pleased with him), who was among the last of the Companions of the Messenger of Allah (peace and blessings be upon him) to remain in Madinah. He said: "There is no one left among the Muslims who knows more about it than I do. Sayyidah Fatimah (may Allah be pleased with her) was washing the blood from the blessed face of the Messenger of Allah (peace and blessings be upon him), and Sayyiduna Ali (may Allah be pleased with him) was bringing water in his shield. Then a reed mat was taken and burned, and his wound was packed with it."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5895