Imam Hussain (sws) Sayyid al-Shuhada', "the lord among martyrs" is the second child of Imam Ali (asws) and Bibi Fatima (asws). His zahoor was in the year 4 A.H. After the martyrdom of his brother Imam Hasan Mujtaba (asws) became Imam through Divine Command and his brother's will.
Every year on the 10th of Muharam the Shia Muslims all over the world commemorate the martyrdom of Imam Hussain (sws). The commemoration start from the first day and the peak reached on the 10th day.The month of Muharram is of great religious significance to Islamic people the world over. It is held to be the most sacred of all the months, excluding Ramadan. The word "Muharram" is often considered synonymous with "Ashura", the tenth day of the Muharram month.
At dawn the Imam (a.s.) glanced over the army of Yazid and saw Umar ibn-e-Sa'ad ordering his forces to march towards him. He gathered his followers and addressed them thus:" Allah has, this day, permitted us for our martyrdom.
So prepare yourselves to fight against the enemies of Islam with patience and resistance. O sons of the noble and self - respecting persons, be patient! Death is nothing but a bridge which you must cross after facing trials and tribulations so as to reach Heaven and its joys. Which of you do not like to go from this prison (world) to the lofty palaces (Paradise)?" Having heard the Imam's (a.s.) address, all his companions were overwhelmed and cried out ," O our Master! We are all ready to defend you and your Ahlul-bayt, and to sacrifice our lives for the cause of Islam."
Imam Hussain (a.s.) sent out his companions from his camp one after another to fight and sacrifice their lives in the way of the Lord. Lastly, when all his men and children had laid down their lives, Imam Hussain (a.s.) brought his six- month old baby son Ali Asghar (a.s.), and offering him on his own hands, demanded some water for the baby, dying of thirst. The thirst of the baby was quenched by a deadly poisoned arrow from the brute's forces, which pinned the baby's neck to the arm of the helpless father.
When the six-month old baby also was killed, Imam Hussain (a.s.) addressed Allah (swt): "O Lord! Your Hussain has offered in your way whatever your had blessed him with. Bless Your Hussain, O Lord! with the acceptance of this sacrifice. Every thing Hussain could do till now was through Your help and by Your Grace." Lastly Imam Hussain (a.s.) came into the field and was martyred, the details of which merciless slaughter are heart rending.
Abu Mukhnaf narrates from Jaludi who says, “When Imam Hussain (asws) fell down from the saddle of His Horse, the Horse of Imam Hussain (asws) kept circling around His fallen body. Whenever the army (la) tried getting close the fallen body of Imam Hussain (asws), He (the horse of Imam Hussain (asws) would attack them and kill them by striking them down with the hooves of His feet. He killed 40 soliders from the yazidi army (la). Then He covered His forehead with the blood of Imam Hussain (asws) and returned to the tents. When He reached near the tents, He began to neigh and began to stomp the ground. He was informing Ahlul Bayt (asws) that Imam Hussain (asw) had been martyred.
(Manaqib Aale Abi Talib (as) Fourth Edition page no 58 ref Maqtal e Abi Mukhnaf )
The forces of Yazid (LA) having killed Imam Hussain (a.s.), cut and severed his head from his body and raised it on a lance. The severed head of the Holy Imam (a.s.) began glorifying Allah (swt) from the point of the lance saying,` Allahu Akbar'. "All glory be to Allah Who is the Greatest!" After the wholesale, merciless and most brutal slaughter of the Holy Imam (a.s.) with his faithful band, the helpless ladies and children along with the son of Imam Hussain (a.s.), Imam Ali Zain-ul-Abideen (a.s.), were taken captives.