Serbian atrocities became so shameful that the Europeans finally agreed to American plans for sustained bombing.

The operation is noted for Japan's sustained bombing of cities in central west China.

About 1,500 rebels were thought to have taken part in the assault which was carried out in the face of sustained bombing from the Air Force.

This objective can be achieved at a relatively low cost through air power and sustained bombings.

And Mr. Cheney also implied that an additional period of sustained bombing and air attacks was needed before a ground attack could begin.

Doubts surfaced as to the effectiveness of large-scale, sustained bombing.

The city's lower reaches look as if they suffered sustained aerial bombing.

It said the Islamic militia's fighters had been forced to retreat with their weapons and equipment because of sustained bombing by American warplanes.

Casualty figures climbing into the thousands could wear down the coalition's cohesion, making sustained bombing a riskier tactic.

It seemed a clear acknowledgement of significant disruption after more than two weeks of sustained bombing.