What did soldiers develop to protect themselves from the new destructive weapons of war?

Soldiers developed various forms of protective gear and tactics to counter the threats posed by new destructive weapons of war, such as machine guns and chemical agents. Innovations included reinforced helmets, body armor, and gas masks to shield against bullets and toxic gases. Additionally, trench warfare tactics were employed to provide cover and reduce exposure to enemy fire. The evolution of military technology also led to the development of armored vehicles to enhance mobility and protection on the battlefield.