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Organization, and Service in World War I  

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In April 1917, because of the continued loss of American shipping and lives on the high seas at the hands of the German Navy, the United States declared war on Germany and thus entered into the Great War in Europe, which some two decades later would be known retroactively as World War I. The following month Congress passed the Selective Service Act that, among other things, called for a “draft” of the National Guard into active federal service.  Some units began mobilizing earlier, but on 5 August all National Guard units across the country were collectively drafted into federal service.  Units from the States of Indiana (with the exception of one regiment), Kentucky, and West Virginia were ordered to report to a military training camp that had been established about 10 miles south-southeast of the small town of Hattiesburg in southeastern Mississippi.
The fact was, however, that it was not much of a camp at all.  For the most part it was just a lot of uncleared land covered with pine stumps. It was so new that is had not yet been named.  Kentucky troops were the first to arrive, so for them the
 

 
 
 
 

 

 

 

camp was named in honor of their state’s first governor, Isaac Shelby.  It was soon turned into a military post of tents, some wooden buildings, more tents, dirt roads, and more tents with a capacity of about 36,000 troops.
State militia/National Guard units that fought in the Revolutionary War, the Mexican War, the War Between the States, and all other wars up through 1916-17.  Mexican Border service had always entered active federal service with, and retained while on active duty, their traditional independent state designations (e.g., the 3d Indiana Infantry).
But that practice would now change.  The Army for the first time was forming standardized, structured divisions and adopting a standard numbering system for all regular Army, National Guard, and National Army (draftee) divisions.  Division numbers 1-25 were reserved for the regular Army.  National Guard divisions started with the number 26, which was the first National Guard division to be numbered (25+1=26th Division).  The 13th National Guard division in line to be numbered was the 38th (25+13=38th Division).
On Saturday, 25 August 1917 at Camp Shelby, Mississippi, the 38th Division was organized.  It was formed from the independent National Guard units mobilized from the three states.  Indiana furnished most of the troops, Kentucky furnished a great part, and West Virginia the rest.  Independent state military designations were soon lost as all were redesignated and reorganized according to standard Army regimental and other unit configurations.
Notwithstanding having to clear ground and set up a camp from scratch, the new division structure began to take shape, not all at once, but by the separate in-turn organization of subordinate brigades, regiments, and other elements.  It was October before the 38th Division was fully organized and in place as a division.
All Army divisions formed would in time come to be known as “square” divisions because their main combat capability was built around four newly designed infantry regiments.  Each regiment’s wartime strength was set at some 3,800 men, and consisted of a headquarters, support elements, and three infantry battalions.  Major elements of the new 38th were organized from state troops indicated below.  Numerical designations were dictated by the Army’s new standardized numbering system.
 

Headquarters, and Headquarters Troops, 38th Division (Indiana, Kentucky, West Virginia)

Headquarters 75th Infantry Brigade (Kentucky)
149th Infantry Regiment (Kentucky) 150th Infantry Regiment (West Virginia)
138th Machine Gun Battalion (Kentucky) Headquarters 76th Infantry Brigade (Indiana)
151st Infantry Regiment (Indiana) 152d Infantry Regiment (Indiana)
139th Machine Gun Battalion (Indiana) Headquarters 63d Field Artillery Brigade (Kentucky)
137th field Artillery Regiment [75mm Field Gun] (Indiana) 138th Field Artillery Regiment [75mm Field Gun] (Kentucky)
139th Field Artillery Regiment [75mm Field Gun, but eventually transitioned to 6-in and 155mm Howitzers] (Indiana) 113th Trench Mortar Battery (Kentucky)
137th Machine Gun Battalion (West Virginia) 113th Engineers [Regiment] (Indiana, Kentucky, West Virginia)
113th field Signal Battalion (Indiana, Kentucky)

Headquarters and Military Police, 113th Divisional Trains (Indiana, Kentucky, West Virginia)

113th Ammunition Train (Kentucky, West Virginia) 113th Supply Train (Indiana, Kentucky, West Virginia)
113th engineer Train (West Virginia) 113th Sanitary Train (Indiana, Kentucky), including 149th, 150th, 151st, 152d Ambulance Companies, 149th, 150th, 151st, 152d Field Hospitals
   
 

  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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