Sometimes palisade fences come under attack with people trying to remove the bottom palisade pale fixings to allow them to move one pale out of position and gain entry through the fence. An additional low rail provides an extra degree of security to the bottom part of the palisade fence from this kind of attack. Even with this additional lower rail, it is always a good idea to keep a clear corridor along the back of any fence so that any intrusion through the fence can be quickly identified and remedied.