The war quickly escalated: some 550,000 American troops were there by 1969.

With the one hope for peace ruined, the war escalated.

This change was suspended when the war escalated once again.

It seems the war down south will escalate quite soon.

Within weeks the war escalated to take in the rest of the countryside which meant no place was safe.

As the war escalated into its second year, the concerns for air raids were greater than ever.

But in the sixth grade the war between them suddenly escalated.

The war on the home front escalated when Jin turned 15 and fell for a black girl at school.

The covert war against Iran, if not stopped, could escalate out of control.

It was clear that despite all the efforts at peace-making, the war had only escalated.