I should have looked more carefully at the link I gave earlier:
https://www.cwgc.org/find-records/fi...H%20HALLIWELL/
in particular at the 2 items listed under “Concentration” toward the bottom of the page (scroll down).
https://www.cwgc.org/find-records/fi.../#&gid=2&pid=2
They are two copies of the same thing but the last column of the sheet indicates the previous location of gave. This gives the location where the body of Halliwell was found. Note it says:
“Isolated grave near BRETTORF, GSGS 4416 1/100.000, Sht M 3, MR 472854. “
At the top of the sheet it gives the current location of the grave (in Rheinberg Cemetery) as:
MR A 185264.
The co-ordinates they are giving are based on a grid system explained on this website:
http://www.echodelta.net/mbs/eng-welcome.php
The locations are in the “Nord de Guerre Zone Grid”. A little confusion on the way they are giving the leading letters, but Rheinberg Cemetery is at rA185264 and the original grave location near Brettorf is at rW472854. Using the translator (which gives locations within 150 to 1000 meters of actual location) we get a location of 52.96261N, 8.43891E (which is right in the middle of a field).
https://www.google.com/maps/place/52...6261!4d8.43891
If we can locate a copy of the actual map they were using (GSGS 4416 1/100.000, Sht M 3) we might do a little better on the location on the original grave.
Here might be a map to use:
http://legacy.lib.utexas.edu/maps/am...-bremen-m3.jpg