Question

What effect did the use of trenches and new technologies during World War I have?

Warfare was far deadlier than in the past and resulted in enormous casualties.
There were fewer battlefield casualties than in the past.
The war concluded much earlier than earlier wars.
Most deaths were related to injuries suffered after the war than during it.

Answer 1

Warfare was far deadlier than in the past and resulted in enormous casualties.

Trench systems plus technologies like machine guns, heavy artillery, poison gas, and barbed wire produced deadly stalemates and massive casualty totals from frontal attacks and prolonged bombardments.