Record Data Place Unit Type State or Province Containing Unit Mexico Events Date Type 03/24/1857 American adventurer Henry A. Crabb leads an expeditionary force across the Mexican border into Sonora Battles/Soldiers 11/03/1853 American filibuster William Walker proclaims himself president of an independent "Republic of Lower California" Military/Violent 09/21/1852 French adventurer Gaston Raousset declares Sonora (Mexico) to be an independent republic Foreign 06/01/1852 French filibuster Gaston Raoul Raousset arrives in the northern Mexican state of Sonora Battles/Soldiers 10/29/1852 Gaston Raousset departs Mexico for San Francisco Battles/Soldiers 04/07/1857 Henry A. Crabb and 57 of his followers are executed by a Mexican firing squad Military/Violent 04/04/1854 William Walker and his fellow filibusters leave Baja California for Sonora Battles/Soldiers People Places Name Type Guaymas, Mexico City or Town Hermosillo, Sonora City or Town Documents Date Title 04/01/1859 San Francisco (CA) Evening Bulletin, “Filibusterism and Disunion,” April 1, 1859 Images