In addition, the advantage is that it is also able to prevent metastasis upon the death of a tumor.

Sumter was the key position for preventing a naval attack upon Charleston, so secessionists were determined not to allow federal forces to remain there indefinitely.

There was but one way of preventing an attack upon the frigate.

His dive had ended in water deep enough to prevent a crush upon the submerged rocks.

Frederick's son Christian was openly Lutheran, which prevented his election to the throne upon his father's death.

You should bring the supporting documentation that you provided with your visa application to prevent delays upon arrival in Gabon.

"I fired upon this intruder only to prevent his firing upon me."

That should prevent any problems upon arrival.

They urged the queen to marry or nominate an heir, to prevent a civil war upon her death.

Pureflush: A toilet that prevents the spread of bacteria upon flushing.