“Definite orders” are issued November 26, 1917:
American Infantry Officers’ School,
La Valbonne Branch, France.
November 26, 1917.
Special Order
No. 10
Pursuant to telegraphic instructions from Hq, A.E.F., dated November 25, 1917, the following named infantry officers will proceed to Paris, France, reporting upon arrival to the Commanding General, Lines of Communication, for duty.
[Sixteen names including]
Montgomery, Thomas C, 2nd Lt. U.S.R
. . . .
The travel directed is necessary in the military service. [no date for travel or arrival]
A.B. Drum
Major, U.S.M.C.
Monty at War 