How did gas warfare change the face of combat during world war i? (5 points)
soldiers had to wear special masks to protect themselves.
it replaced the use of air raids and machine guns in battle.
it led to mass military desertions on the battlefields.
chemicals such as mustard gas replaced trench warfare.

The correct answer is: Soldiers had to wear special masks to protect themselves.

The use of poisonous gas in the First World War was an important military innovation. Some of the gases used were tear gas, mustard gas and phosgene.

None of the countries that participated in the First World War was prepared for the introduction of poisonous gas as a weapon. Once the gas appeared, the development of protections against it began, and the process continued during the course of the war, producing more and more effective gas masks.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.