i dont really know i think 300 ft
It was used to get under the palisade around the castle
Palisade
a sturdy wooden fence used for a fortification.
Warwick Castle
yes it is
Norman
NO
it was a norman castle
Well There is lots of Norman Castles but the first one around that time was the motte and Bailey Castle.
your dad
On Motte and Bailey castles the wooden fence is called a palisade.
in London