1. Teeth Arm

Cavalry Squadron

SHQ (Bttn HQ): 2 men, pistols, horses
4 Troops@
THQ: 2(6 man) rifle sqds, horses, sabres, pistols
2 platoons@ 1(6 man) rifle PHQ sqd, horses, sabres, pistols
4(8-11 man) rifle sqds, horses, sabres, pistols

Attached Infantry Battalion

Bttn HQ: 1(5 man) rifle sqd
4 Companies@
CHQ: 1-2 rifle sqds
2 platoons@ 4(12 man) rifle sqds

2. Regiment Support

Cavalry Regiment

HQ: 5-8 rifle sqds, horses with:
1 MG Troop:
THQ: 1 pistol sqd, horses
2 platoons@ 3x Benet-Mercie LMG, 40 crew, horses, pistols

Infantry Regiment

HQ: 3 rifle sqds, 3 rifle sqds on horses with:
1 MG Company:
CHQ: (12 man) pistol sqd
2 platoons@ 2x Benet-Mercie LMG, pack mules, 20 men

3. Divisional Support

Up to:

2 Horse Artillery Battalions@
BHQ: 6 rifle sqds, horses, Obsolete FC
3 batteries@ 4x 75mm M16, horses

3 Engineer Companies@

CHQ: 2 rifle sqds, horses
2 platoons@ 3-4(12 man) rifle/engineer sqds, horses

1 Air Squadron

4. Notes

a) No radios available.
b) In 1914 there were 13 Regiments on the Mexican border, 1 in the US, 2 in the Philippines, and 1 in Hawaii. By 1917 there were 9 Regiments on the Mexican border, forming into the 15th Cavalry Division in late 1917.
c) The Cavalry Division has 3 Brigades each of 3 Cavalry Regiments, 1-2 attached infantry Regiments, each of 3 battalions.
d) Cavalry Regiments each have 3 Squadrons.