In the context of World War I, 'stalemate' refers to the impossibility of achieving decisive results through battlefield conflicts and clashes. Territory might be gained or regained; advances were sometimes made; small victories might be won. Yet, until late in the war, stalemate dominated the war's major fronts, with no significant or decisive results able to be won, no matter how much effort (or life) was expended.
With machine guns, barbed wire, poison gas, and artillery, there was a trench warfare stalemate on the Western Front in WWI. It was finally broken by the tank [a British (Winston Churchill) invention] the deployment of fresh American troops, and the blockade of German ports, which meant that the civilians back in Germany were starving and could no longer afford to support the soldiers on the battlefield.
The machine gun which could reap such serious damage to troops in the open.
If I understand the question,
Trench.
Many squads didn't move much more than a few feet over the period of the war.
Most of WW1 was fought in trenches, with both sides equally stocked and it quickly ended in stalemate, weapons like poison gas and the tank were developed to break the stalemate.
Trench warfare, dead man's land
Machine gun
the germans had alien technology
The United States entry into the war
The entry of the U.S. into the war.
Stalemate.
Would you mind reposting your question with a little more information? There was a stalemate in most of World War I, but World War II happened in so many places, that I do not know of the occurence in your question . . .
no one gains or looses ground
8 years
On a Coast Line somewhere
The stalemate generally refers to the Trench warfare in France 1915-1918.
the entry of the U.S. into the war.
They did help break the stalemate.