Muharram: The Month That The Prophet Muhammad's Grandson Was Martyred by The Al-Qaeda of His Day
On the other hand, the staying power of the rulers (Mu'awiya and his son Yazid) depended solely on the might of the sword. They used brute force to rule over the Muslim empire even by all possible illicit means (Similar to Wahabi inspired Al-Qaeda).
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Imam Husain was quick to realize that giving allegiance of loyalty to Yazid would serve no purpose but to jeopardize the survival of Islam. To safeguard and protect Islam, therefore, the Imam had no choice but to confront and collide with Yazid's rulership irrespective of consequences. Since Yazid had ordered his commanders to seize the Imam's allegiance of loyalty at any cost, even by brutal force, the commanders had to assemble a relatively large army, surrounding Imam Husain's camp in a desert called Karbala. Then they cut off the basic necessities to the camp, including access to water. The camp consisted of Imam Husain, his family, friends, and companions, all of whom stood fast and firmly with him. These braves would rather face death for the noble cause of Islam, than submit to the outrageous tyranny and the un-Islamic ways of Yazid (The Osama Bin Laden of his day).