Another excerpt from John Sayen’s Battalion: An Organizational Study of United States Infantry currently being serialized on Bruce Gudmundsson’s Tactical Notebook shows where US infantry units (US Army and USMC) were deployed aside from those assigned to Pershing’s AEF on the Western Front in France:
Apart from the war in Europe, the principal military concern of the Wilson administration during 1917-18 was the protection of resources and installations considered vital to the war effort. The threat of German sabotage in the United States was taken very seriously. In addition, Mexico was still unstable politically and sporadic border clashes continued to occur into 1919. Mexican oil was also regarded as an essential resource and the troops stationed on the Mexican border were prepared to invade in order to keep it flowing. However, all the National Guard, National Army, and even the Regular Army regiments raised for wartime only were reserved for duty with the AEF. (The National Army 332nd and 339th Regiments did deploy to Italy and North Russia, respectively, but both remained under AEF command.) This left non-AEF assignments in the hands of the pre-war Regular Army regiments.
Out of 38 Regular infantry regiments available in 1917, 25 were on guard duty within the Continental United States or on the Mexican border and 13 garrisoned U.S. possessions overseas. Local defense forces raised in Hawaii and the Philippines eventually freed the pre-war regiments stationed in those places for duty elsewhere. By the end of the war the 15th Infantry in China, the 33rd and 65th (Puerto Rican) Infantry in the Canal Zone, and the 27th and 31st Infantry (both under the AEF tables) in Siberia were the only non-AEF regiments still overseas. Inside the United States state militia (non-National Guard) units and 48 newly raised battalions of “United States Guards” (recruited from men physically disqualified for overseas service) had freed 20 regiments from stateside guard duties, but not in time for any of them to fight in France.
Only twelve pre-war regiments actually saw combat in the AEF. Nine of them served with the early-arriving 1st, 2nd, and 3rd AEF Divisions. The other three were with the late arriving 5th and 7th Divisions. One more reached France with the 8th Division, but only days ahead of the Armistice. By this time, the Regular Army regiments had long ago been stripped of most of their pre-war men to provide cadre for new units. They were refilled with so many draftees that their makeup scarcely differed from those of the National Army.*
The situation with the Marines was similar to that of the Regular Army. Most Marine regiments had to perform security and colonial policing duties that kept them away from the “real” war in France. Also like the Army, the Marines made Herculean efforts to accommodate a flood of recruits, acquiring training bases at Quantico Virginia and Parris Island South Carolina, as their existing facilities became too crowded. The Second Regiment (First Provisional Brigade) continued to police Haiti while the Third and Fourth Regiments (Second Provisional Brigade) did the same for the Dominican Republic. The First Regiment remained at Philadelphia as the core of the Advance Base Force (ABF) but its role soon became little more than that of a caretaker of ABF equipment.
Although there was little danger from the German High Seas Fleet ABF units might still be needed in the Caribbean to help secure the Panama Canal and a few other critical points against potential attacks by German surface raiders or heavily armed “U-cruisers.” Political unrest was endangering both the Cuban sugar crop and Mexican oil. To address such concerns, the Marines raised the Seventh, Eighth, and Ninth Regiments as infantry units in August, October, and November 1917, respectively. The Seventh, with eight companies went to Guantanamo, Cuba, to protect American sugar interests. The Ninth Regiment (nine companies) and the headquarters of the Third Provisional Brigade followed. The Eighth Regiment with 10 companies, meanwhile, went to Fort Crockett near Galveston, Texas to be available to seize the Mexican oil fields with an amphibious landing, should the situation in Mexico get out of hand.
Three other rifle companies (possibly the ones missing from the Seventh and Ninth Regiments) occupied the Virgin Islands against possible raids by German submarines. In August 1918, the Seventh and Ninth Regiments expanded to 10 companies each. The situation in Cuba having subsided, the Marine garrison there was reduced to just the Seventh Regiment. The Ninth Regiment and the Third Brigade headquarters joined the Eighth at Fort Crockett.**
* Order of Battle of the United States Land Forces in the World War op cit pp. 310-314 and 1372-1379. A battalion of United States Guards was allowed 31 officers and 600 men. These units were recruited mainly from draftees physically disqualified for overseas service. The 27th and 31st Infantry when sent to Siberia were configured as AEF regiments, though they were never part of the AEF. Large numbers of men had to be drafted out of the 8th Division to build these two regiments up to AEF strength. This seriously disrupted the 8th Division’s organization.
** Order of Battle of the United States Land Forces in the World War op cit pp. 1372-78; Truman R. Strobridge, A Brief History of the Ninth Marines (Washington DC, Historical Division HQ US Marine Corps; revised version 1967) pp. 1-2; James S. Santelli, A Brief History of the Eighth Marines (Washington DC, Historical Division HQ US Marine Corps; 1976) pp. 1-3; and James S. Santelli, A Brief History of the Seventh Marines (Washington DC, Historical Division HQ US Marine Corps; 1980) pp. 1-5.
