The loss of his radio-knife meant he was now unable to summon assistance.

The officers pulled behind the van after summoning back-up assistance.

I must survive to summon assistance, alert the others to what has befallen here.

The shepherd summoned assistance, and a crowd returned to the scene.

The other made for shore, hoping to summon assistance from the Dutch authorities.

"Shall I summon assistance to have the boy removed, my lady?"

When things get hot on the beat, a police officer usually barks out a quick "10-13" into his radio to summon assistance.

"I happened to know the nature of the gentleman's complaint, and thought it might be necessary to summon assistance in a hurry."

Your task is to rescue him or summon assistance, and you performed quite well.

Guards at the gate then summoned the police and medical assistance.