Fortified land has indestructible.
Whenever fortified land becomes tapped, target creature gets +1/+1 until end of turn.
Fortify( : Attach to target land you control. Fortify only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the land leaves.)
5/1/2007 Fortification is to lands what Equipment is to creatures. Except for the difference regarding what kind of permanent it can affect, Fortifications and Equipment follow the same rules.
5/1/2007 If Darksteel Garrison and the fortified land would be destroyed at the same time, only Darksteel Garrison is destroyed.
5/1/2007 The second ability triggers whenever the fortified land becomes tapped, not just when it’s tapped for mana.
5/1/2007 The triggered ability is mandatory. If you don’t have a creature to target, you must target another player’s creature, if possible.