Martha Is Dead is a grim psychological triller about twin sisters, set in Italy at the end of WW2. It's not about war, however. This game left me with deep emotions no other game could do. Heed the warnings given by authors, though. It may come too disturbing to some people.
Martha is Dead. A tragic and frightening story. Heed to the warnings they give at the start, tho. My wife literally got sick from playing it. No other game or movie has touched me that deep.
Now it reminded me of Vladimir Sorokin's "Horse soup". Time to read it again.