From: Cross Country Jumps
A solid row of wooden planks is usually described to as a palisade fence.
Palisades can be jumped either as a single fence or with the addition of a ditch or brush added into the fence. Palisades usually ride incredibly well, however their position will of course add in a higher difficulty rating as well as if the palisade forms part of a combination.
Palisade fences are often positioned at the top of a hill or slope so that horses are having to jumping into empty space, which is a great test of both horse and riders bravery and balance.
The addition of a ditch in front or a brush behind adds to the width, height and technical difficulty of a fence as will the addition of other fences either before or after.
Riding A Palisade
How you ride a palisade will largely depend on its positioning on a cross course. If the jump has a ditch just before it then a useful ground line will be present, however an inexperienced rider may find themselves looking into the ditch rather than over the fence causing the horse to also loose concentration and possibly stop.
A palisade fence on the top of a hill requires positive riding, with sufficient impulsion but not too much speed to enable the horse to remain balanced on landing, this is especially important if the slope is particularly steep or if there are other fences directly after it, which is often the case.