US 41st Infantry Division

US 41st Infantry Division
Unit name	41st Infantry Division
Caption	Shoulder sleeve insignia
Dates	1917–1946; 1946–1968
Country	United States
Branch	United States Army
Type	Infantry
Size	Division
Nickname	"Sunset Division"
Battles	World War I, World War II
Notable commanders	William G. Haan, George W. Griner Jr., Kees Beekhuis

US 41st Infantry Division was a formation of the United States Army that served in both World War I and World War II, drawing personnel primarily from Oregon, Washington, and Idaho. The division participated in major campaigns across the Western Front and the Pacific War and underwent significant reorganizations during the National Guard transitions of the interwar and postwar eras. Its record includes combat operations, occupation duties, and contributions to American military doctrine through evolving divisional structure and equipment.

Formation and Early History

The division was constituted in 1917 during the American mobilization for World War I and organized at Camp Greene, North Carolina, under the oversight of the National Army and the United States Department of War. Early commanders included officers with careers tied to the Philippine–American War and the Mexican Border operations, reflecting prewar militia experience drawn from the Oregon National Guard, Washington National Guard, and Idaho National Guard. Training emphasized integration of infantry, artillery, and support elements modeled on lessons from the British Expeditionary Force and the French Army.

World War I Service

After transatlantic deployment, the division entered the Western Front and was assigned to sectors alongside formations such as the American Expeditionary Forces and the British Fourth Army. It participated in trench warfare operations influenced by doctrines from General John J. Pershing and coordination with the French Fourth Army. Elements conducted reliefs in the St. Mihiel salient area and supported offensive and defensive operations during the 1918 campaigns, interacting with logistical systems like the Services of Supply and medical evacuation practices from Base Hospitals.

Interwar Period and Reorganization

Following demobilization after Armistice Day, the division was reconstituted in the National Guard system, with headquarters tied to state adjutant generals and the War Department. The interwar years saw doctrinal debates influenced by publications from the United States Army War College and exercises under the supervision of the Chief of Staff of the United States Army. Reorganization efforts reflected shifts motivated by the National Defense Act of 1920, interactions with Regular Army staff, and the adoption of new training methods exemplified at Camp Lewis and Fort Lewis maneuvers.

World War II Campaigns and Operations

During World War II, the division was federalized and deployed to the Pacific Theater of Operations. It conducted amphibious and jungle operations in campaigns that included actions in the New Guinea campaign, the Philippines campaign, and island-hopping operations coordinated with United States Navy and United States Marine Corps forces. Command relationships linked the division with higher echelon units such as the I Corps and the Sixth Army, and it engaged enemy formations of the Imperial Japanese Army while operating in environments described in after-action reports by staff officers trained at the Command and General Staff College. Logistics were supported through convoys organized by the United States Army Services of Supply and staging areas like Hawaii and Australia.

Postwar Activities and Inactivation

After Japan's surrender following the capitulation, the division took part in occupation duties and demobilization procedures under directives from the War Department and the United States Army Forces Pacific. Postwar National Guard restructuring under the National Defense Act Amendments and the reorganization of the Army National Guard led to the division's inactivation and realignment of units into state brigades and regiments. Personnel transitions involved transfer orders processed through Separation Centers and records archived with the National Archives and Records Administration.

Organization, Structure, and Equipment

The division's table of organization and equipment evolved from a World War I square division with infantry brigades to a World War II triangular division with three infantry regiments and divisional artillery. Subordinate units included infantry regiments, field artillery battalions, engineer combat battalions, medical battalions, and signal companies, organized according to doctrine promulgated by the War Department General Staff. Equipment ranged from small arms like the M1 Garand and the Thompson submachine gun to artillery such as the M2 105 mm howitzer and transport vehicles including the Quartermaster Corps trucks and amphibious landing craft coordinated with the Naval Amphibious Force.

Legacy and Honors

The division earned campaign streamers and unit citations reflecting participation in major World War I and World War II campaigns; citations were issued in accordance with criteria overseen by the Department of the Army and published in general orders. Veterans associated with the division contributed to publications and reunions coordinated through organizations like the Veterans of Foreign Wars and state veterans groups in Oregon, Washington, and Idaho. Historical studies of the division appear in archives at institutions such as the United States Army Center of Military History and university special collections, preserving its operational record and influence on subsequent United States Army force structure.

Category:Infantry divisions of the United States Army Category:Military units and formations established in 1917