Errol Flynn is Maj. Geoffrey Vickers, a British officer who leads a famous counter attack in India.

This is a poor man's Gunga Din, and not very faithful to history or the poem by Lord Alfred Tennyson.
It's got visuals that seem authentic: palaces, forts, vistas, horses and nice costumes.
It's also got the gorgeous Olivia de Havilland, who starred with Flynn in several Warner Brothers classics.
I'm glad I saw this, but I don't need to see it again.