The duress must involve the threat of imminent peril of death or serious injury, operating on the defendant's mind and overbearing his will.

Voluntarily and at his own imminent peril went into the enemy's lines at night and, under a sharp fire, rescued a wounded comrade.

In the face of the imminent peril confronting his homeland, he was filled with fury and grief.

In the absence of imminent peril, the actions of a rescuer may be perceived by the courts to be reckless and not worthy of protection.

With no food and no gas to melt the snow into water, the team members were in imminent peril.