We cannot prevent war, not in the present state of our world.

They had gone out to try to prevent a war.

Yet there was still a chance to prevent a general war.

You could tell a thousand and they would not prevent war.

We learn to make better guns, not to prevent war.

We are fighting in Iraq to prevent a civil war.

And perhaps, she thought, I can prevent a shooting war.

And, in any event, it would have been impossible to prevent war.

The aim of arms control is to prevent nuclear war.

Nor can it be said that they haven't prevented war.