I have read some of Juarez and the Franco-Mexican War, and at least Muni looks a lot like Juarez. Claude Rains does a bang up job as Napoleon III, and overall it is a good flick. It leaves you much more sympathetic to Maximilian and not so much to Juarez.

Paul Muni as patriot in conflict with French oppression in mid-1800s Mexico. Great 1939 roles for Brian Aherne, as Emperor Maximilian and Bette Davis as wife Carlotta, with yet another grand portrayal by Claude Rains, as Napoleon III. Directed by William Dieterle.