The martyrs of Uhud were not washed, and they were buried with their blood. No prayer was offered over them.
Sunan Abi Dawud Book 21, Hadith 47
← Previous Hadith The Messenger of Allah (ﷺ) commanded to remove weapons and skins from the martyrs of Uhud, and that they should be buried with their blood and clothes.

Sunan Abi Dawud Book 21, Hadith 46 Next Hadith → The Messenger of Allah (ﷺ) passed Hamzah who was killed and disfigured. He said: If Safiyyah were not grieved, I would have left him until the birds and beasts of prey would have eaten him, and he would have been resurrected from their bellies. The garments were scanty and the slain were in great number. So one, two and three persons were shrouded in one garment. The narrator Qutaybah added: They were then buried in one grave. The Messenger of Allah (ﷺ) asked: Which of the two learnt the Qur'an more? He then advanced him toward the qiblah (direction of prayer).

Sunan Abi Dawud Book 21, Hadith 48