Not talking about the method of Warfare but sickness. Troops at Gallipolli suffered terribly with dysentery etc and then we had lots of illness in the trenches during winter with frost bite, colds and general flu. Then we have things like trench foot (esp in muddy\waterlogged areas) and finally towards the end of the War Spanish Flu. So I think the game needs attrition and things like this. The first winter during the War I know the Allies on the Western Front suffered enormously from troops falling ill as they didn't have the techniques to deal with it, alot of trench foot was because we were on the lower ground in fields that required alot of drainage through a system of drainage ditches (The Germans had got to the higher ground first so most of the War allied trench system was overlooked. Instead of pulling the line back abit onto ground not overlooked the generals weren't willing to give an inch so overlooked the PBI stayed. With the Germans pumping water out of their trench and down the field into the allied trench with a chuckle I'm sure). The drainage system was obviously damaged though shelling so water was soon pouring into he trenches. eventually they rebuilt all the trench system above ground in the parts of northern France and Belgium that where flooded.
Anyway will this sort of attrition be modeled?