A person may use reasonable force to prevent the commission of a tort against his property. Generally, a request to leave must precede the use of force. Use of this defense is limited to prevent the commission of the tort. When the plaintiff has been permanently dispossessed of the personal property and the commission of the tort is completed, he may not use force to recapture the chattel except in case of 'hot pursuit.' One may use mechanical devices for the protection of one's property as long as such means are essential and reasonable under the circumstances. A proper warning must be posted and usage of the device cannot create a threat or exposure to serious bodily harm. A defendant is privileged to threaten a greater amount of force than that which would actually be used, provided that these threats would only cause fright or apprehension in the plaintiff.