This is a movie that has been made twice. The first was a silent version in 1916 and the one I watched was made twenty years later. It stars John Boles, Wallace Beery and Barbara Stanwyck.
The story is based on the actual event of Rowan's (played by John Boles) carrying a message from President McKinley to Garcia in Cuba during the Spanish-American War.
Some pretty good performances by all the cast but Wallace Beery steals the picture IMO.