which of the following threats did soldiers face in the trenches? fire starvation collapse disease; what was a result of the use of chemical weapons during world war i?; during the meuse-argonne offensive of 1918, the americans helped; by the time american troops entered world war i, the allies; which army developed tanks first for use during world war i?; which of the following was a benefit of using heavy artillery instead of machine guns?; during world war i, the arrival of american troops boosted allied morale because they; during world war i, the zigzag pattern of trenches on the front lines was designed to