In one screen shot I saw Flevoland, premature existing on the wargame map. The IJsselmeer polders created in Lake IJssel (being the former Zuider Sea) are ARTIFICAL created polder land masses. On the game map I have discovered a region named Emmeloord. During the game period Emmeloord (and its region) did not exist. It was founded in the during the SECOND World War created North East Polder. The large Flevo Polder island in the south east part of the former Zuider Sea (since 1932 Lake IJssel) is artifical created during the nineteen 50s and 60s.
On the game map is the south east shore of the Zuider Sea marshy, a wrong landscape. That area is in real not a polder landscape, Flevoland did not exist yet, but being the Veluwe region, known for its large forests, heathlands and sand drifts. If Ageod wish to create a good World War One game it's i.m.o. important to take care regarding the Zuider Sea works.
See the Veluwe landscape: http://en.wikipedia.org/wiki/Veluwe
The Zuider Sea Works: http://en.wikipedia.org/wiki/Zuiderzee_Works
Flevoland, not existing before the second half of the 20th century: http://en.wikipedia.org/wiki/Flevoland
And information regarding the Dutch defence, the New Dutch Waterline, see: http://en.wikipedia.org/wiki/Hollandic_Water_Line