Who was the first Indian Army officer to be promoted to the rank of field marshal?

Explanation

Sam Manekshaw: Chief of the Army Staff of the Indian Army during the Indo-Pakistani War of 1971. Field Marshal is a five–star General officer rank and the highest attainable rank in the Indian Army. KM Cariappa: First Indian Commander -in-Chief of the Indian Army. Vikram Batra: Martyr of Kargil war, Param Vir Chakra (1999).