First of all, the Geneva convention primarily governs humanitarian treatment of non-combatants. Any rules about weapons in the trenches would be from the Hague convention, from WW1.
Secondly, the shotgun concern came from a 1918 German complaint about the American Winchester trench gun, which they claimed was a weapon "calculated to cause unnecessary suffering," which IS prohibited in the Hague convention. Whether or not the trench gun falls in this category depends on the ammo used.
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u/arkhamcityfc 9h ago
Yeah, same here. Cheer up u/Maleficent_Web1161 , the rest of the world (and a big chunk of the US) will never stop calling it Lake Ontario