Siege Contest Clarifications:

The target will be a fixed distance d (diagram below) behind a wall.  The center of the hole will be a fixed height h above the horizontal surface.  Your projectile must pass through the hole!  It may not go over the wall.

You can set up your launcher at any distance (x) from the wall, but once you begin, x cannot be changed.  You will, however, be allowed to adjust the launch angle (theta, below) after any of your three shots.  You will also be allowed to swivel your launcher left or right.