It is impossible to offer a definitive answer to this question because of statistics on exactly what weapon caused each death were not kept.
The machine gun use was widespread throughout the different fronts, causing the majority of deaths. An example of this was the first day of the Battle of the Somme, Britain suffered 60,000 casualties, the majority of which were the result of machine gun fire.
Some estimates range up towards 90% of casualties were directly attributable to machine guns, when troops "went over the top" and tried to take an enemy trench. With the ability to fire about 500 rounds per minute, this statistic is not unreasonable.
There are no figures for the total number of casualties caused by machine guns in WW1. But an internet search found an example of the effectiveness of the weapon - On the first day of the Somme Offensive, the British lost 60.000 soldiers mostly due to machine gun fire.
A Lewis gun was an early type of machine gun used in WW1.
the machine gun
It is impossible to give a definitive amount. Certainly many thousands.
I believe it was improved later on after WW1
There are no figures for the total number of casualties caused by machine guns in WW1. But an internet search found an example of the effectiveness of the weapon - On the first day of the Somme Offensive, the British lost 60.000 soldiers mostly due to machine gun fire.
the maxim gun
The machine gun was first introduced in World War II. This was the first war with massive numbers of casualties due to destructive weaponry and guerilla warfare, among other causes. It is impossible to pinpoint exactly how many deaths the machine gun has caused since its introduction, or even in that war alone.
A Lewis gun was an early type of machine gun used in WW1.
the machine gun
The machine gun caused trench warfare to be a necessity as 90%+ of the casualties of WW1 were from this weapon. The use of Napoleonic tactics against new technologies was disastrous.
Potato Digger
It is impossible to give a definitive amount. Certainly many thousands.
THE MACHINE GUN and THE POISONUS GAS
I believe it was improved later on after WW1
The death total from WWI was estematied to be around 8,528,831 machineguns were about 20%
The machine gun, the submarine, new warship designs.