In the month of Muharram 61 AH (approx. 20 October 680 AD), an event took place in Iraq at a place known as Kerbala on the bank of the river Euphrates. It seemed in those days insignificant from the historical point of view. A large army which had been mobilised by the Umayyah regime besieged a group of persons numbering less than a hundred and put them under pressure to pay allegiance to the Caliph of the time and submit to his authority. The small group resisted and a severe battle took place in which they were all killed.
It appeared at that time that like hundreds of similar events, this battle would be recorded in history and forgotten in time. However, the events that occurred on the 10th day of Muharram in Kerbala were to become a beacon and an inspiration for future generations. In this article, we shall examine briefly the principal adversaries.
The Messenger of Allah said: "Al-Hasan and al-Husain are the chiefs of the youth of Paradise and Fatimah is the chief of their women."[1-2]
Abu Huraira narrated:
The Prophet (PBUH) looked toward Ali, Hasan, Husain, and Fatimah , and then said: "I am in war with those who will fight you, and inpeace with those who are peaceful to you."[1-3]
With the passing away of his brother Hasan(A) in 50 AH, Husain (A) became the leader of the household of the Holy Prophet (S). He respected the agreement of peace signed by Hasan (A) and Muawiya, and, despite the urging of his followers, he did not undertake any activity that threatened the political status quo. Rather he continued with the responsibility of looking after the religious needs of the people and was recognised for his knowledge, piety and generosity. An example of the depth of his perception can be seen in his beautiful du'a on the day of Arafat, wherein he begins by explaining the qualities of Allah, saying:
On the other hand, we have Yazid, whose father (Muawiya) and grandfather (Abu Sufyan - the arch-enemy of the Prophet) had always tried to sabotage the mission of the Holy Prophet, and who showed his true colour by stating in a poem, "Bani Hashim had staged a play to obtain kingdom, there was neither any news from God nor any revelation." 
Mas'udi writes that Yazid was a pleasure-seeking person, given to wine drinking and playing with pets. It is no wonder that Husain's response to Yazid's governor, when asked to pay allegiance to Yazid was, "We are the household of the prophethood, the source of messengership, the descending-place of the angels, through us Allah had began (showering His favours) and with us He has perfected (His favours), whereas Yazid is a sinful person, a drunkard, the killer of innocent people and one who openly indulges in sinful acts. A person like me can never pledge allegiance to a person like him ..." 
Hussain (A) was killed on the battlefield as he did Sajdah. His head was removed from his body on the plains of Kerbala, mounted on a spear, and paraded through villages and towns as it was taken to Damascus and presented at the feet of Yazid.
Husain ibn Ali said:
"Don't you see that the truth is not followedand the falsehood is not discouraged? (The situation is so severe) so that a Believer wishes to meet Allah (i.e., to die). And today I don't see death but prosperity, and living with tyrants is nothing but disgust and disgrace."
In the day of Ashura: "If you do not have an religion, then at least be free (open-minded) in your present life."
"People are the slaves of this world, and religionis just in their tong. They keep it as long as it meets their comfortable life. But when the test comes, religion holders become very few."
STORY of KARBALA Pictoral for Kids
(1) Sahih al-Tirmidhi, v5, p660, on the authority of Abu Sa'id and
(2) Sunan Ibn Majah, Introduction 8
 Ibn Jarir: Tarikhu'l Umam wa'l Muluk, vol.13, p.2174.
 Sayyid ibn Ta'us: Maqtalu'l Husain, pp.10-11
 Hilyatul Awliyaa, by Abu Nu'aym, v2, p39