Was the machine gun the most revolutionary weapon?

[buritobr]

The firearms were used in Europe in the first time in the 14th century. The first firearm was the cannon. Then, in the 16th century, individual firearms were introduced in the warfare. First, the musket, and many years after, the rifle.
However, even in the 19th century wars, like the Napoleonic Wars, the American Civil War and the Franco Prussian War, when the armies used cannons, muskets and rifles, the battles looked like the classic definition of battle. Two armies met and fought in formation. The duration of this fight was not more than one day. The battle ended when one of the armies was destroyed. The range of the weapons was not big, the sight was not good, it used to take time to reload. So, not all soldiers used to die because of the bullets. The opposing armies had enough time to meet each other. The bayonet was a very important army, since five centuries after the use of the first firearm, the hand to hand combat was not abolished.
Everything changed in the WWI. Because of the machine gun, it was not possible to stand up and shoot anymore, in order to not expose your own body to the enemies' bullets. It was necessary to lay down in order to shoot. The formation became obsolete. Marching became only a cerimony. One could not talk about "battle" anymore. The Battle of Somme and Battle of Verdun were not battles according to the classic definition.
Tanks were important, but they were introduced only in 1916. So, I think that the most important weapon to change everything in the warfare was the machine gun.