Two months after the U.S. declaration of war following the sinking of RMS "Lusitania", 10 officers and 200 enlisted men of the 6th Field Artillery were transferred to the newly formed 11th Field Artillery at Camp Jones near Douglas, Arizona. These numbers were supplemented by draftees from New York, Ohio, Missouri, and California. At full wartime strength, the 11th had 63 officers, 1496 enlisted, and 24 guns.