Mare Nostrum (1926)
Mare Nostrum (1926) is a silent film set during World War I. A Spanish merchant sailor becomes involved with a spy. It was the first production made in voluntary exile by Rex Ingram and starred his wife, Alice Terry. It is based on the novel of the same name by Vicente Blasco Ibáñez. Long thought lost, the film has recently been re-discovered and restored.
More at Wikipedia.