Battle of al-Qādisiyyah
Abdullah Ibn Umm-Maktum requested Umar, the second Caliph of Islam, to let him take part in Jihad in spite of his blindness. Umar allowed him to take part in the Battle of al-Qādisiyyah in 636 C.E. He served in the battle as the standard bearer for the Muslim side, and he was martyred in the fighting.