What aspect of the war was the greatest cause of casualties? modern weapons trench foot nationalism untrained soldiers

Modern weapons

Explanation:

One of the reasons why World War I had such a high number of casualties was the fact that many modern weapons were developed during these years. These weapons proved extremely lethal, and contributed to the lengthening and the stalemate of the war. Some of these weapons include machine guns, flamethrowers, mortars, modern artillery, poison gas, tanks and submarines.

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