<span>C) the invasion of Poland
It happened in 1939, before all of the other events.
Hope this helps :)</span>
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Ex. Civil Service Exam
Answer:
a.The guns made it easier for troops to gain ground rapidly and fearlessly by crossing trenches.
Explanation:
The machine gun revolutionized combat endeavors and rapidly drove out countries with their horse-drawn carriages into submission. From its uncovered roots beginnings to the advancement of this notable weapon that is still being used today, it figured out how to practically without any assistance change the result of WWI and along these lines change the craft of war.