I think it's almost certainly the machine gun. I'm thinking the machine gun kills more than the artillery shell. It is therefore sad to think that most men, armed as they were with a rifle, were very ineffectual in terms of fighting: they were simply targets.
Perhaps the most feared was the use of poison gases, tear gas, mustard gas, phosgene and chlorine. The idea of being sent home blinded has a chilling effect on the troops.
Perhaps the words of General of the Armies "Black Jack" Pershing after the Battle of Belleau Wood answers the question: "The deadliest weapon in the world is a Marine and his rifle."
The war was the deadliest in history up to that point
Nuclear weapons
balls & wieners
Probably artillery; it was responsible for many of the deaths in World War 1.
The tank.
American Civil War
The Civil War World War 1 The Revolutionary War
The submarine.
Man.
Yes, and WW2 had the most casualties world-wide.
Chemical weapons and the machine gun
The war was the deadliest in history up to that point
Poison Gas.
Battle of the Argonne Forest
The most common one that was used as a weapon in World War 1 is called the Artillery
broken pistolthe zeppelin was the least important weapon in ww1.
The most common method was with artillery.It is NOT a biological weapon, it is a chemical weapon.