Interesting idea, and a good idea for schools, but FPS style games of pre-WWII may struggle to adapt the FPS mentality to the tactics of the time.
Take for example Napoleonic Wars, a mod for Mount and Blade, a lovely mod, but unless you form up an online squad the likelihood of you engaging in a Napoleonic era line battle is incredibly low. It does sometimes happen, I recall an excellent defence in a 'Capture the Fort' map which involved a room of British soldiers in a two rank line which worked brilliantly until a well aimed howitzer shell killed us all.
But, if they put in a single player side to it then it will work out well.
