Imam Hussain (AS) made any effort to clarify the truth and goals for which they rose up and were ready to sacrifice their lives. We should know that the Human values mattered more than the victory in its apparent sense in the battle of Karbala and no sin was committed by the leader of this battle, Imam Hussain (AS), in achieving his purpose.
The only reason for the soldiers to fight was sincerely following in their Imam's (AS) footsteps and remaining loyal to him.
In this motion graphic, you can see the story of Imam Hussain (AS) from the month of Rajab to the month of Safar and the day of Arbaeen.