Yet to continue trench warfare as before would be a mistake.

Most of the fighting that happened in this area was trench warfare.

The future need not be characterized by more trench warfare.

"I think we'd be in trench warfare for another 20 years."

Instead, the soldiers settled in for another eight months of trench warfare.

After six years of partisan trench warfare, that will not be easy.

It is the closest thing to trench warfare the city has known.

They dread being caught in the trench warfare of politics.

Instead, the long stalemate of trench warfare was ready to begin.

Trench warfare was incredibly costly in terms of human life.