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The Amiga classic 'Wings' deserves a mention
Maybe a Total War: The Great War could work? - be interesting at least...
I present my favorite casual game, World War 1 Medic, as proof that even Trench Warfare can be tremendously entertaining.

See gameplay footage here. Commentary isn't great but at least he explains the gameplay and the sound effects are showcased.

Can download it from the developer here

Love that game. Feel like a badass every time I save some poor sucker for bonus points.