be at war
fight a war

Everybody had been set up to fight the cold war.

More resources are needed to fight the war, he said.

Only where am I going to find the money to fight a war?

Europe was about to fight a war to open up China by force.

You see why I say we'll never fight a war?

Are the three of us going to fight a war with their army?

I'd just as soon not fight a war at the same time.

The question was, did he want to go on fighting the same old war himself or try something new?

She could see they were each fighting the war in their own way.

But there's more than one way to fight a war.