The Prophet (peace be upon him) said that the fight will start with the Muslims and the polytheists (who are Murutipuja).

Gayawatul Hind Hindustan (Final) War Rasul (S) one day looked at the east and was taking a great breath, when a Sahabi asked the Prophet (s), why are you doing this? Rasul said: I smell the victory in the east. Asked, "O Rasulullah, what are you smelling?" The Prophet (peace be upon him) said that the fight will start with the Muslims and the polytheists (who are Murutipuja). The battle will be asymmetrical. The Muslim army will be limited in number but the Mushrik senibahini will be more in number.
In that war, Muslims will die so much that Muslims will drown to the feet of Muslim feet. In that war the Muslims will be divided into three groups: one share of the fleeing after fleeing the fear of the Mushrari Bahini, they are the people of Hell. One more person will be martyred in battle. The last part will continue to fight on the basis of God and ultimately win.
The Prophet (peace be upon him) said that this war was equivalent to Badar (Subhan Allah). He also said that at that time the Muslims should join the war wherever they are. (Nasai Sharif Khand, 01, page 152 and Taberni, Nasa'i Sharif, Sunain Nasai Khand. 06 page 42)