Revolt of the Zombies (1936)

 Revolt of the Zombies (1936) 

The plot of the film has a Cambodian priest coming to aid the French during World War One. He is willing to use his powers to make an army of zombies to help the French win the war. When a successful demonstration frightens the French as much as the enemy the priest is locked up to save mankind from his power. While confined the priest is killed by someone looking to learn the secret. The French are frightened that someone else might learn the secret of zombies and sends an expedition to Cambodia to find any trace of the secret so it can be safeguarded. Unfortunately one of the men sent on the expedition discovers the secret just as his love life goes south and he begins to put his new found power to a dark purpose.

(IMDB)