Military Division of the Pacific Military Division of the Pacific The Military Division of the Pacific was a major command (Department) of the United States Army during the late 19th century. On July 27, 1865 the Military Division of the Pacific was created under Major General Henry W. Halleck, replacing the Department of the Pacific, consisting of the Department of the Columbia that now consisted of the state of Oregon and the territories of Washington and Idaho and the expanded Department of California that now consisted of the states of California and Nevada and the Territory of New Mexico and Territory of Arizona. Headquarters for
California Pacific Railroad the route of the California Northern Railroad between Vallejo and Suisun and can be seen along portions of State Route 12. The original Cal-P line ran to Vallejo, not along the present main line route through the Suisun Marsh between Suisun – Benicia – Martinez. The Southern Pacific line between Martinez and Sacramento (or perhaps Oakland and Sacramento) was informally known as the "Cal-P" after the original builder of the line, the California Pacific Railroad. California Pacific purchased the Napa Valley Rail Road at foreclosure on June 9, 1869. The Napa Valley Rail Road was built from the head of