Catapult
Just place the pieces and when the catapult is finished it is created and turned the right way. When places it is fired with "e". The catapult fires three stones at a time and is very deadly.
The catapult is the largest of the structures in the game. It can be constructed out of wood by the builder.
It takes 2 wood to construct each piece and since its made of 12 pieces it needs in total 24 wood.
To build it just place the pieces in a 4 * 3 square and when the catapult is finished it is created and turned the right way.
To use it, you must first load it. Bring rocks to it and press "e" to fill it up.
To shoot, press and hold "e" to aim. The longer you hold the further you shoot. The shots are aimed with mouse. Release "e" to shoot.
Gameplay tips
The catapult fires three stones at a time and can be very deadly. A well placed, fortified catapult can keep the enemies at bay even when outnumbered.
Trivia
At the moment there is a bug that makes the catapult have infinite ammunition sometimes. It has been acknowledged by the developer and will be fixed soon. [Fixed June 03 2011]