The Drum (1938)
AdventureWar
Set in the India of the British Raj, the evil and untrustworthy Prince Guhl (Raymond Massey) plans to wipe out the British troops as they enjoy the hospitality of Guhl's spacious palace. It's up to the loyal young Prince Azim (Sabu) to warn the troops of Guhl's treachery by tapping out a message on his drum.