Hand painted battle scene with royalty on canvas from India circa 1960s

This piece is about 1.25 meters tall and about 3 meters wide. From what I recall it took the artist 6 months to paint this battle scene. It's circa 1960s and in very good condition. I'd like to know from what part of India this might be from and a potential value. If possible, I'd like to know what the painting is depicting.