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-First widespread use of machine guns.

-First widespread use of gas agents, including: Chlorine gas, Phosgene and mustard gas. Nerve gasses were not used until the 1930's. Deployed mostly by shell and big canisters.

-First widespread use of effective indirect artillery fire (fire outside of the line-of-sight.)

-First tanks.

-First use of airplanes. Primarily for reconnaissance, limited combat use, limited water use. Also the first air-to-air combat by airplanes.

-Metal-hulled Battleships.

-Infantry weapons were mostly bolt-action rifles.

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13y ago

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