Modernization of Warfare!!
U-boats- submarine warships with armed torpedoes.
Convoy system- a group of merchants vessels sailing together.
American Expeditionary Force- all of the military personnels.
Trench Warfare- men being trapped down in the trenches waiting for the right moments to pop up and fight the other forces.
The turning of Modernization
"No Man's Land"
There were two sides in trenches and the land in between them was no mans land because no one would move or they would die on sight.