Trebuchets are so cool! We watched a great show on NOVA (PBS) a couple years
back about how trebuchets were built and used. They made a rock wall
(substitute for a castle wall) and built a large model trebuchet and
proceeded to destroy the wall. You can see a slide show about it on the
site: http://www.pbs.org/wgbh/nova/lostempires/trebuchet/builds.html
We have a field that would be perfect for a trebuchet....