Answer
In the Battle of Karbala, Ali al-Sajjad, the fourth Shia Imam, miraculously survived despite being severely injured. While his father, Imam Hussein, and most of his family and companions were martyred, Ali al-Sajjad was spared due to his young age and ill health. He witnessed the horrors of the battle and later became a key figure in preserving and transmitting the legacy of the Karbala tragedy.