Learning from history, al-Mahdi

Then Amīr al-mu’minīn shouted at the top of his voice : al jihād, al jihād (fighting, fighting), O creatures of Allāh ! By Allāh, I am mobilizing the army today. He who desires to proceed towards Allāh should come forward.

Nawf says : Then Amīr al-mu’minīn put Ḥusayn (a.s.) over (a force of) ten thousand, Qays ibn Sa‘d (mercy of Allāh be upon him) over ten thousand, Abū Ayyūb al-Anṣārī over ten thousand, and others over different numbers, intending to return to Ṣiffīn, but Friday did not appear again and the accursed Ibn Muljam (May Allāh curse him) killed him. Consequently, the armies came back and were left like sheep who had lost their shepherd while wolves were snatching them away from all sides.