Who was tribal leader Birsa Munda, mentioned by Salman in 'Battle of Galwan' teaser?

In the teaser of 'Battle of Galwan', actor Salman Khan hailed Jharkhand's tribal leader Birsa Munda. Known as 'Dharti Aba' (Father of the Earth), 'Bhagwan' Birsa Munda was viewed as a divine figure who was gifted with a healing touch. He led a powerful movement, Ulgulan, against British exploitation, fighting for tribal land rights and cultural identity.