The trip was cut short by the start of World War I.

At the start of World War I, he went into battle with them.

Neither work was complete at the start of World War I.

His works were extremely popular between 1900 and the start of World War I.

The society folded in 1914 at the start of World War I.

This boom would level off at the start of World War I.

They were prevented by the start of World War I.

The first bombers were made at the start of World War I.

The start of World War I in 1914 suddenly stopped most international movement, which only resumed after 1919.

At the start of World War I, the village's economy went downhill.