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What different declorations on the use of specific weapons of war could have been created from the Hague convention of 1899?
One example that I know of is from the TL Damsels and Dirigiables in which the decloration of prohibiting "Projectiles the Object of Which is the Diffusion of Asphyxiating or Deleterious Gases" is passed over to prohibit the use of sniper rifles. I'm not sure if that choice is really plausible though.
Any other ideas and how wars of the 1900s could be altered?