What tools and methods did people use to solve the various problem that they had?

When were tanks first introduced to the war?
1916
1914
1920
Why were gas masks created in WWI?
To keep dirt out of their eyes
To protect them from poisonous gases
Why were trenches used in WWI?
They were cheap
They had more protection than open combat
Trenches could be around 400 miles long and 7 ft deep
True
False
The front line was the most dangerous area of the trenches
True
False
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