During the first year of World War I, none of the combatants offered steel helmets to their troops.

He served in the last year of World War I and was a member of the Freikorps.

Zinoviev spent the first three years of World War I in Switzerland.

According to official nomenclature, two other offensives during the last year of World War I, 1918, also use this name:

In 1918, the last year of World War I, he was shot down and he died.

In the first year or so of World War I, air combat was more of a one-on-one affair.

He guided the University through the years of World War I and the phenomenal growth that followed the war.

After that his only service was prior to and during the early years of World War I in reserve bands.

In 1914, during the first year of World War I, he was twice awarded the Iron Cross.

When the machine pistol was first introduced during the last year of World War I, it was used in trench warfare.