Islam Guidance

After hatching the conspiracy and achieving ultimate martyrdom of Imam Hassan (A.S), Muawiya started campaigning openly for the succession of his son Yazid to the office of Caliphate. Until that time he had always planned in secret about this intention. To materialize his plans, he started his campaign among his most trusted people in Syria where he had established his headquarters. Later on, his missionaries took the message to other parts of the Islamic world and with the help of lot of money and bribery he got support for the caliphate of Yazid from a number of important Islamic cities.
After his death in Shabaan of the 60th Hijrah, Yazid sat on his throne and started the campaign of getting Baiyat of all Muslims so that they would accept him as the Caliph. The materialistic personalities of that time came forward and accepted his caliphate. Among them were mostly the people who were known for their enmity towards the Ahlul-Bayt (A.S) of our Prophet Muhammad (P.B.U.H&H.P). The other group was of the people who were either coerced by force or treachery or their loyalties were bought through material offers.
When the campaign crossed the borders of Syria, instructions were sent to the Governor of Medina – Walid ibn-e-Aqba ibn-e-Abu Sufyan – as well to get the baiyat of Imam Hussein (A.S). According to some historians, Yazid also mentioned that if Imam Hussein (A.S) declines his baiyat then Walid should kill him and send his head to Syria. Walid invited the Imam (A.S) to his court and gave him the orders of Yazid and demanded his baiyat. Imam (A.S) replied “A person like me would never accept the baiyat of a person like Yazid”. In this statement, Imam (A.S) gave a clear guideline for all the future time to come.
One of the advisors of Walid named Marwan bin Hakm incited Walid on getting Imam (A.S) killed right there but Imam (A.S) was joined by a few of his followers from Bani Hashim under the leadership of Hazrat Abbas (A.S) and returned safely from the court.
Within a few days time, the political developments made it very clear that Yazid is going all out to either obtain the baiyat of Imam Hussein (A.S) or to get him killed. Imam (A.S) had the sanctity of Medina as well as the salvation of the religion of Islam in his mind, therefore, he decided to leave Medina and go towards Iraq. He asked for the preparation of a Caravan of his selected family members and his trusted friends and set off for this long journey on the 28th of Rajab.
When Imam (A.S) had made his decision to leave Madina, he went to the grave of his brother Imam Hassan (A.S) with a very heavy heart. There he stayed for some time talking to his brother saying "O brother now your killers are after my blood. It looks like time for my martyrdom is near and I am leaving you now.". I imagine that Imam Hassan (A.S) would have replied from his grave – O my brother I bid you farewell and give you my son Qasim to become your sacrifice in Karbala.
After that Imam (A.S) went to the grave of his grandfather, the Holy Prophet Muhammad (P.B.U.H&H.P). He stayed there for a long time and wept a lot until he went to sleep. He saw the Prophet (P.B.U.H&H.P) in his dream and said to him "O my grandfather, my salutations to you. The land of Medina has become small for me. Tyrants among your ummah are after my blood and I am leaving Medina with a heavy heart".
Finally Imam Hussein (A.S) came to the grave of his mother Hazrat Fatima Zahra (S.A). Historians write that Imam (A.S) ran towards her grave just like a child runs toward his mother and he fell on her grave just like a child falls in the lap of the mother. Imam (A.S) said "O my mother accept my last salam. I am leaving the land of Medina and would not come back. The prophecy of my grandfather is about to come true". I imagine that Hazrat Zahra (S.A) would have said from her grave "O my beloved son, O the one whom I have raised by keeping awake in the night, I would not let you go alone. From this day I would not rest in my grave but I would accompany you throughout your journey."
Historians write that throughout the journey various people reported to Imam (A.S) that when everyone goes asleep during the night, we hear feminine voices of weeping and Bibi’s voice crying "Ya Hussein, Ya Hussein". Imam (A.S) told them "O my trusted companions this is my mother Zahra (S.A) who is with me ever since I have left Medina".

Derived from: Imam Reza.Network

Abu Bakr, son of Imam al-Hassan son of the Commander of the Faithful (A.S), came out. His first name was Abdullah al-Akbar [Abdullah senior] and his mother was Ramla. He fought till he was killed.
After the latter, his full-blooded brother, Qasim, came out. He was a lad who had not yet come of age. When Hussain (A.S), looked at him, he hugged him and wept. Then he permitted him to fight, so he came out with a face looking like a full moon bearing a sword and wearing a shirt and a mantle. On his feet he wore sandals. He had to fight on foot. The sandal's string on his left foot was cut off, so he, the son of the great Prophet (P.B.U.H&H.P) hated to walk bare-footed on the battlefield. He, therefore, stopped for a moment to tie his sandal6, regarding those enemies as no more valuable than his own sandal, paying no heed to their multitude, feeling unconcerned about their thousands.
As he was thus engaged, ` Amr Ibn Sa'd Ibn Nafil al-Azdi attacked him. Hamid ibn Muslim asked him: “What do you want to do to this lad? Are you not satisfied to see the entire crowd that surrounds him?”
He said: “By Allah I shall attack him!”
He hit Qasim with his sword. The lad fell face-long crying out: “O uncle!”
Hussain (A.S) came out to his help like an angry lion and struck Amr with his sword. Amr tried to avoid it with his arm, so the Imam cut it off from the elbow, causing him to let out a very loud scream which was heard by the entire army. The cavalry of Ibn Sa'd charged in order to rescue him. Amr met them face-to-face, causing their horses to trample upon him and to eventually kill him.
After some time the cloud of dust dissipated, so Hussain (A.S) was now seen standing at the head of the young boy, examining his feet. Hussain (A.S) said:  “Away with people who have killed you while their opponent on the Day of Judgment will be your grandfather (P.B.U.H&H.P)!” Then he said: “Hard it is, by Allah, that you call upon your uncle to help you and he cannot answer your call, or that he does answer it but cannot do much for you. It is a lone voice whose enemies are numerous and whose supporters are few.” Then he carried him away.
Qasim was on Hussain's chest; his legs were dragging on the ground. Hussain (A.S) put the corpse beside that of Ali al-Akbar and of those of his family who had been killed. Then he raised his eyes to the heavens and supplicated thus:
O Allah! Count their numbers, and do not leave any of them alone, and do not forgive a single one of them! Be patient, O cousins! Be patient, O my Ahlulbayt! You shall never meet any hardship after today at all. [Al-Khwarizmi, Maqtal al-Hussain, Vol. 2, p. 28]

Maqtal al-Hussain- Martyrdom Epic of Imam al-Hussain
By: Abd al-Razzaq al-Muqarram

“O Prophet! Indeed we have sent you as a witness, as a bearer of good news and as a warner and as a summoned to Allah by His permission, and as a radiant lamp.” (Quran 33:45, 46)
The Prophet (P.B.U.H&H.P), when a Jew asked him about the reason for him being called Muhammad, Ahmad, Abu al-Qasim, Bashir, Nadhir, and Dai - he replied, 'As for Muhammad, I am praised [mahmud] in this earth, and Ahmad is that I am praised in the Heaven . As for Abu al-Qasim, Allah will divide the Day of Resurrection into two parts; the part (qisma) of Hell, and those who disbelieve in me from among the first ones to the last ones will be in the Hellfire; and the part of Heaven, and whoever believes in me from among the first ones to the last ones, and has acknowledged my prophet hood will be in Heaven. Al-Dai [the caller] is that I call people to the religion of my Lord Almighty. Al-Nadhir [the warner] is that I warn people who disobey me about the Hellfire. Al-Bashir [bringer of good news] is that I bring the good news of Heaven to those who obey me.'
(Maani al-Akhbar, p. 52, no.2)

Ref : Shia Hadith Website