What weapon caused the most deaths in ww1?

Artillery

I would have to disagree. The most dangerous weapons commanded by man in that war would have to be the machine gun. Tens of thousands died when they went and charged into nests of them. The most dangerous weapon of nature in that war was disease. I think as many men died of disease as they did from combat deaths.

Artillery, obviously, that's why steel helmets were introduced, artillery barrage would throw in the air countless stuff which then fell in the heads of the soldiers wounding them and later killing most of the wounded. Machine gun was a strong weapon but artillery was more deadly over time. If artillery was that weak and machine gun that strong, we wouldnt have seen so much artillery in WW2.