Object: The Attacker wins if he can occupy the 15 places of the 'Fortress'. The Defender wins if he reduces the attacking army to less than 15 pieces.
 
The Attacker moves only sideays or forward (orthogonally or diagonally) one step at a time.
The Defender can move one step into all directions and captures by jumping. Jumps are forced. The Defender may jump several times in a row with one piece.
 
Fortress is a historic relative of the game 'Fox and Geese'. Source: Book 'Unsere Spiele' by Werner Hirte.
 
 
For more freeware as well as real puzzles and games see my home page http://karl.kiwi.gen.nz.