Every player starts with one Guard and seven Tower pieces. The goal of the game is to either capture the enemy Guard or move your own Guard to the marked square on the enemy side of the board.
 
All pieces move orthogonally only. The Guard steps one square, capturing anything on its destination square.
 
A Tower steps exactly as many squares as the number of pieces it consists of. It can capture the enemy Guard or an enemy Tower by replacement, but only if the enemy Tower consists of equal or less pieces. A Tower cannot jump. However, smaller Towers may be split off from it, which move according to their height too (this is done by clicking on the destination square for the sub-Tower).
 
For further information please check:
www.turm-und-waechter.de (german)
www.gameplate.org (english)