Following failed negotiations, the Umayyad army attacked the camp of Husayn in the afternoon of Tasu'a. As the Umayyad army approached, however, Husayn dispatched his half-brother Abbas ibn Ali and some companions, who convinced the enemy commander Umar ibn Sa'd (d. 686) to delay the confrontation until the following day. Husayn then besieged his followers in a speech to leave and not risk their lives, after which Abbas was the first to renew his support. Nearly all those present stayed with Husayn until the end. By most accounts, Husayn and his men spent that night praying and reading the Quran, the central religious text of Islam. On this night, Husayn's sister Zaynab is said to have reminded her half-brother Abbas of their father's wish for the latter to be the reserves of Karbala, and to be to Husayn as Ali was to Muhammad. This Abbas confirmed and swore to do. There is a report by the Shia historian Ibn Tawus (d. 1266) that Abbas was killed on Tasu'a in a failed sally to bring water for the thirsty camp. Most sources, however, place his death on Ashura.
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