Battle participation of organizations of the American expeditionary forces in France, Belgium,...

For those of you interested in reading about American units that participated in battle in WW1, see the link.
My Grandfather, William John Greenfield, 1895-1968, was a Corporal and member of Company C, 18th Machine Gun Battalion. I never really knew my Grandfather, as I was only 6 when he passed away. He's buried in Long Island National Cemetery. The only thing I know about his service is what I found in the link I provided:
6th Division
12th Infantry Brigade:
54th Infantry—
18th Machine Gun Battalion
(1) Gerardmer sector, Vosges, France, 3 September-12 October, 1918.
(2) Meuse-Argonne offensive, France, 1 November-ll November, 1918.