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In Ms. Stachnik's post she shared two burial cards, the first card from 1920 notes that Pvt. Cotriss was moved from an isolated burial spot ( not part of a larger cemetery) to the Meuse-Argonne Cemetery. At that time it notes that his cause of death which had previously been undetermined was changed to Killed in Action. The second card from 1922 indicates he was moved back to the US.
It is possible for Pvt. Cotriss to have been wounded and died of his wounds on the battlefield. A possible scenario would be that Cotriss was wounded on the battlefield, which was noted by his fellow soldiers, who left him for medics but moved on with their battle attack. It appears that his first burial site was probably close to where he died and his grave was only discovered two years later. So it seems his body was buried where he fell and not taken back to his unit HQ or to a hospital or aid station. There could have been many reasons for this. The Morning Reports for Company H, 147th Infantry would be your best source for what exactly happened to him.
Texas Military Forces Museum
HI Judith, just to add to Ms. Sharik's response, I found a publication from Jan 3, 1919 titled "Official US Bulletin". It lists the names of men wounded in the war, as reported by the American Expeditionary Forces. In this issue, there is an Edward F. Cotriss, of Medina NY (see p 22), listed under "wounded (degree undetermined)". So, given the delay in communications at that time, is it possible that the extent of Pvt. Cotriss' wounds (or even his location) were not known for some time, resulting in differences in official reports? I will say that I am not familiar with this publication or how casualties/deaths were reported.
This issue is at the link below; the other link is for other issues of this publication. Hope this is of some help or interest. joan