This site is the place to look:
http://www.echodelta.net/mbs/eng-grids.php#s4
These are points on the "Nord de Guerre" grid, with full names as follows:
vP6790
vF6790
vF0535
Go to the lefthand margin and click on "The coordinates translator". This leads to a page where you select the grid you want then paste in a set of co-ordinates (in the form I've used) and it will calculate latitude and longitude for you.
After that, just type the figures into GoogleEarth.