According to
Ancestry.com. U.S., Headstone Applications for Military Veterans, 1925-1963, Pvt. William O. Cottles was killed on October 14, 1918, while serving with the 91st Division, 323rd Infantry in France. More information including a photograph of Pvt Cottle can be found at this site:
http://archives.state.al.us/goldstar/images/Cottles_WilliamO/Cottles_WilliamO.html.
More information on PVt. Cottles' death can be found at this site:
http://archives.state.al.us/goldstar/images/card/Cottles_WilliamO.pdf.
A photo of Pvt. Cottles' grave can be found at this site:
https://www.findagrave.com/memorial/92920315/william-o.-cottles.