Here’s something that modern video games decided to pass on, a WW1 FPS.
THE TRENCH is a first person shooter video game on PC taking place during the First World War. You assume the role of a French foot soldier mobilized on the Verdun front. One of the main gameplay mechanics is that you begin the game 3 days before the German assault on the 21st February 1916.
This time allows you to prepare for the future assaults of the Germans. You can request field artillery placements on a precise zone, air support, Trench raiding and the positioning of foot soldiers in strategic places.
These 3 days will allow you to prepare the structure and the scene of the approaching battle.
http://www.thetrench1916.com/