The 13th Division was activated at
Camp Lewis, Washington on 16 July 1918 as part of the U.S. military mobilization for
World War I. It was manned and trained at Camp Lewis in preparation for combat in France, Several existing Regular Army units, and cadres taken from these units, formed the division's nucleus, while
draftees, predominantly from
California,
Montana,
Oregon,
Washington,
Colorado,
North Dakota, and
Utah, filled out the rest of the division. The "
square" 13th Division's complement of four regiments included the
1st,
44th,
75th, and
76th Infantry Regiments. In August 1918, the regiments were organized to form two brigades—the 25th (1st and 75th Regiments, plus the 38th Machine Gun Battalion) -- and the 26th Brigade (44th and 76th Regiments, plus the 39th Machine Gun Battalion).
Task organization • 13th Division Headquarters Troop • 25th Infantry Brigade •
1st Infantry Regiment •
75th Infantry Regiment (organized around cadre from 1st Infantry) • 26th Infantry Brigade •
44th Infantry Regiment (organized around cadre from 14th Infantry) •
76th Infantry Regiment (organized around cadre from 44th Infantry) • 13th Field Artillery Brigade •
37th Field Artillery Regiment •
38th Field Artillery Regiment •
39th Field Artillery Regiment • 13th Trench Mortar Battery • 213th Engineer Regiment • 213th Field Signal Battalion • 13th Train Headquarters and Military Police • 13th Supply Train • 213th Engineer Train • 13th Ammunition Train • 13th Sanitary Train • 249th-252nd Field Hospitals and Ambulance Companies ==Community support==