Which of these military product innovations most dramatically changed infantry tactics during World War I?

Throughout military history, certain product innovations have completely transformed battlefield tactics and strategy. Some developments were so significant they rendered previous military doctrines obsolete overnight. This trivia question explores one of the most influential military product innovations that fundamentally altered how wars were fought in the 20th century. Test your knowledge of how technological advancements in military equipment have shaped the course of modern warfare and national defense strategies.

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The machine gun, which made massed infantry charges obsolete and led to trench warfare
The bayonet, which allowed rifle-equipped soldiers to engage in close combat
The steel helmet, which protected soldiers from artillery shrapnel
The combat boot, which improved soldier mobility in difficult terrain