WWI, not really my area of interest. However, while surfing around military maps on the internet I came across this site that some on this forum might find useful, especially if you are into maps.
Caution, extremely expensive. But maybe someone might be tempted if they have lots of spare cash.
Great idea but too pricey.
"Whoever wishes to master the art of war must study it continuously. I....am of the opinion that one lifetime is not enough to attain this goal." - Frederick II