Mail Steamship Company purchased Pacific Mail steamers on the Atlantic side, and George Law sold his new company and its ships to the Pacific Mail. One of the company's steamships, the SS Winfield Scott, acquired when the New York and California Steamship Company went out of business, ran aground on Anacapa Island in 1853. In 1854, Marshall Owen Roberts purchased Law's interest and became president of Pacific Mail. During the American Civil War the ships of the Pacific Mail, that carried the gold and silver of the western mines to the eastern states were under threat from the Confederate Navy in the form of commerce raiders, and several plots to seize one of their steamships for its precious cargo or to convert it into a raider to capture one of its other ships with such cargo. After one of these plots, that of the Salvador Pirates came to light, to prevent any further attempts to seize Pacific coast shipping, General McDowell ordered each passenger on board American merchant steamers to surrender all weapons when boarding the ship and every passenger and his baggage was searched. All officers were armed for the protection of their ships. Detachments of Union soldiers sailed with Pacific Mail steamers. In 1867, the company launched the first regularly scheduled trans-Pacific steamship service with a route between San Francisco, Hong Kong, and Yokohama, and extended service to Shanghai. This route led to an influx of Japanese and Chinese immigrants, bringing additional cultural diversity to California. As the Central Pacific and Union Pacific railroads met in Utah in 1869, the profitability of the Pacific Mail on the run from Panama to San Francisco ended. Many of its ships were sold or put on other routes. 1870–1925 While docked at San José de Guatemala, the Pacific Mail steamship SS Acapulco was involved in the Barrundia Affair of 1890. General Juan Martín Barrundia, a Guatemalan rebel general wanted by the Guatemalan government, was killed aboard ship after an attempted arrest by Guatemalan police, who hauled down the American flag and raised the Guatemalan flag in its place. The affair led to the recall of the U.S. Minister to Central America, Lansing Bond Mizner, by President Benjamin Harrison. The company was a charter member of the Dow Jones Transportation Average. In 1925, the company was purchased by Robert Dollar, of the Dollar Steamship Company. With the government bail-out of the Dollar