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During the Mexican Civil War of 1913, mercenary Tom Bryan (Rory Calhoun) and his Lewis machine gun he names ("La Cucaracha") joins a band of revolutionaries headed by Colonel Juan Castro (Gilbert Roland).
Agnes Salm-Salm (December 25, 1844 – December 21, 1912) was the American wife of Prince Felix zu Salm-Salm, a Prussian mercenary beside whom she played a role in the American Civil War, the Mexican Civil War between President Benito Juárez and the Austrian archduke Maximilian I of Mexico, and the Franco-Prussian War.