Which of these things were elements of trenches? Check all that apply.
What was no-man’s-land?
3. Though not particularly effective during World War I, made trench warfare obsolete.
Which factors led to stalemate in the trenches? Check all that apply.
Which statement about submarine use in World War I is true?
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 .
Check any reasons you think make morale important to an army.
How did the United States contribute to the Allied victory? Check all that apply.
During World War I, aircraft were primarily used for .
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