bigpigeon.us webpage WWII > WWII Ground Forces > Infantry Organization, updated by RAC 18 Jul 2022.
US WWII Infantry Division Organization
Along with an headquarters company and some components smaller than a company in size, each Army infantry division contained the following organic (i.e., permanent) units:
- three infantry regiments.
- four field artillery battalions.
- one each of a signal, quartermaster, and ordnance company.
- a reconnaissance troop (troops were company-sized).
- an engineer combat battalion.
- a medical battalion.
Infantry regiment and battalion organization
Army and Marine Corps infantry regiments had a similar organization. Each regiment had three battalions, and each battalion had four companies:
Army infantry rifle company organization - Each rifle company had three rifle platoons and one weapons platoon.
- A rifle platoon had three rifle squads.
- A rifle company weapons platoon included .30 caliber air-cooled machine guns and 60mm mortars.
Infantry division artillery organization
In 20th century wars, artillery fire caused more casualties than small arms fire.
Supporting this fact, the US deployed massive amounts of artillery in WWII. Each infantry division contained four artillery battalions, with additional battalions held in corps and army reserve.
Note from the accompanying graphic that WWII divisional artillery, known as divarty, was authorized to have 36 105mm howitzers and 12 155mm howitzers. During WWII most artillery, except in armored artillery battalions, was towed rather than self-propelled.
Army Infantry division artillery:
Army Light Armored division:
- Three battalions of 105-mm howitzers and one of 155-mm howitzers.
- In addition, each infantry regiment had a 105-mm howitzer cannon company and a 57-mm gun antitank company.
- Four or five artillery battalions, organized into a 4th regiment; e.g., the 22nd Marine Regiment (artillery) was the 4th regiment in the 1st Marine Division.
- Early in WW II, a marine division’s artillery regiment had three battalions of 75-mm pack howitzers and one of 105-mm howitzers.
- As the war progressed, more 105-mm howitzers were added and the number of pack howitzers was reduced.
Army Light Armored division:
- Three battalions of self-propelled 105-mm howitzers mounted on the M7 Priest motor carriage.
- Battalions were generally equipped with 75-mm pack howitzers.
- In WW II airborne operations, heavier equipment landed in gliders.www.trailblazersww2.org/history_infantrystructure.htm
Sources for the WWII Ground Forces > Infantry Division Organization webpage:
- The webpage header image, WWII Rifle Squad, https://www.battleorder.org/post/usa-rifleco-1944 - c/o https://www.battleorder.org. This graphic depicts a full-strength WWII Army infantry division rifle squad.
- The Infantry - Organization for Combat, WWII, https://www.trailblazersww2.org/history_infantrystructure.htm - by Hugh Foster, 2000 - a well-written description of WWII Army infantry division organization.
- U.S. Army Rifle Company (1942-43), https://www.battleorder.org/usa-riflecoy-1942 - a detailed and well-organized explanation of the early WWII TO&E.
- TO&E Outline for a WWII Infantry Regiment - https://www.custermen.com/ItalyWW2/ArmyOrg/OrgChart/Charts.htm.
- TO&E Outline for WWII Infantry Divarty - https://www.custermen.com/ItalyWW2/ArmyOrg/OrgChart/Charts.htm.