How did the warring nations meet the needs for manpower (soldiers) during the war?

The civilians gave their unwavering support to the military. In America, they supported the military by working for long hours and by providing enough rations to the military. Different organizations were also formed to give a variety of support to the military. During the war, the lack of men in the industries was replaced by more women.  

Climate such as rain may cause the soldiers to develop sickness such as cold. it may be slippery