It is stated in Bihaar al-Anwaar, that before the martyrdom of Qasim, Abdullah bin Hasan, regarding whom we have discussed earlier, entered the battlefield. But the more accurate one is that he went to the battlefield after Qasim, saying, "If you do not know me I am the son of Haydar, I am a Male Lion of the thicket, and am a wild wind upon the enemies".
He put to sword twelve men and Hani bin Sabeet Hazrami killed him (May Allah's Mercy and Blessings be upon him), who's face then turned black.
Abul Faraj relates from Imam Mohammad al Baqir (a.s), that Hurmalah bin Kahil Asadi killed him, and his martyrdom shall be discussed later in the context of the martyrdom of Imam Husain (a.s).
source : http://www.maaref-foundation.com/
