2. Tanks and Armored Vehicles: The introduction of armored vehicles, particularly tanks, transformed ground combat. Tanks provided enhanced mobility, protection, and firepower, enabling troops to advance through previously impenetrable defensive positions. The use of tanks became a defining feature of modern warfare.
3. Chemical Weapons: The use of chemical weapons, such as mustard gas and chlorine gas, marked a grim chapter in the history of warfare. These weapons caused severe injuries and death, leading to international agreements to ban their usage in future conflicts.