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American adventurer Henry A. Crabb leads an expeditionary force across the Mexican border into Sonora

Mexico, 1857, zoomable map
Following the example of Gaston Raousset and William Walker, American adventurer Henry A. Crabb led an expeditionary force of 104 men across the border, with the intent of capturing the northern Mexican territory of Sonora. (By Brian Bockelman)
Source Citation: 
David F. Marley, Wars of the Americas: A Chronology of Armed Conflict in the New World, 1492 to the Present (Santa Barbara, California: ABC-CLIO, 1998), 523.