Tasu'a followed by Ashura
Tasu'a (Arabic: تاسوعاء, romanized: Tāsū‘ā’) is the ninth day of Muharram and the day before Ashura. Several events occurred on this day, including: Shemr's entrance to Karbala, the granting of safe conduct for the children of Umm ul-Banin, preparation for war; and Husayn ibn Ali and his companions were besieged by the enemy (as part of the Battle of Karbala). The day is attributed to Abbas ibn Ali because of his actions as commander in the army of Husayn ibn Ali.