Which of these things were elements of trenches? Check all that apply.
What was no-man’s-land?
Which factors led to stalemate in the trenches? Check all that apply.
Which statement about submarine use in World War I is true?
During World War I, aircraft were primarily used for .
Which statement best summarizes the impact of machine guns and artillery?
1. The use of caused more than 1.3 million casualties.
2. World War I trenches were easily defended through the use of .
3. Though not particularly effective during World War I, made trench warfare obsolete.
Check any reasons you think make morale important to an army.
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