Dear Jon
I don't see how this can be done. It's sort of "in the air" isn't it? Nationalism in the very personal is a state of mind or basic assumption and belief how then in the individual will it differ one from the other be they English, French, German, Russian etc. Further DOES nationalism affect the individual in combat? On the other hand going to the other end yes nationalism is a factor in the war, but again as everyone has it
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I don't see how it is necessary to include as a factor in scenario design. Is one side "more" nationalistic than the other?
On the other hand are you talking about trying to model aspects or traits of nationalism from country to country, that is, claiming a difference between "British" nationalism, and "German" nationalism?
This gets very tricky when you get to Austrian "nationalism.
" for example. I know that in that time there were people who had completely German names in Bohemia who thought the the Bohemian-Czech culture and race was the greatest, and those who had Czech names (like my mother) who thought that the Germans were the master race (before Hitler ever dreamed it up for WWII) and that THEY were part of it.
Nationalism is a very strange thing and does not always typify easily as the history books would have us believe.
Now to be completely truthful I don't do anyting in WWI at the moment, though I do a lot in "Between the Wars" games, which can be run for 1914 onward to about 1943 with the addition or deletion of various rules.
Nationalism can yield some very bizarre things, and some rather unpleasant things, but it can also have very beneficial and not at all malevolent manifestations.
But I can't see how you cram it into a game design.
Otto