He had set double guards to prevent any such attempt.

He remains so throughout the series and actively prevents attempts to change him back.

"Now, we are fighting every day to prevent attempts by the same people to remake America in their image."

Having done so the weather prevented any further attempt to make contact with the prize.

This time, however, due precautions were taken to prevent any attempt at escape.

Despite heavy artillery fire, its defenders prevented any attempt to approach the walls.

In order to prevent blind attempts, negative marking system is employed.

The palace was surrounded by over 100 Spanish soldiers in order to prevent any attempt at rescue.

At the mouth of the harbor, three ships were sunk to prevent any attempt to force the entrance but it was too late.

Ethical considerations have thus far prevented any reported attempt by surgeons to transplant a human being's head.