It was necessary for me to intervene to prevent her death.

Joan decides to intervene immediately to prevent injury to Robert.

Army troops generally did not intervene to prevent the looting.

But the city and state intervened to prevent their sale as condos.

The hope is technology could intervene to prevent accidents.

The Bishop of the day intervened to prevent them for carrying out this plan.

The government, the eugenicists argued, must intervene to prevent this.

If God exists, why doesn't he intervene to prevent such apocalyptic violence?

Sometimes the police intervened to prevent the factions from fighting.

For reasons of history, humanity and security, we have a duty to intervene to prevent the fighting.