I've been wondering if there are any WW1 real time strategies out there - after all the Great War was the ultimate war of attrition and I imagine it could be great managing your resources and come up with a tank...you know the sort of thing. First one I found is a new one called Aggression: Europe 1914 which goes from that date up to the 50s with the atomic bomb.
Trailer here
This was made by the same company who released Entente - a 1914-18 Rts - from 2003 so likely to be a little out of date but maybe worth a try.
Anyway I'll keep looking - anyone know of any more?