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Watchtowers;
Automated alert systems;
Human sentries;
Raven bombs;
Necromancer doomsday weapons;
A massive layer of walls surrounded by a ditch that has tunnels leading into more tunnels that lead to the surface;
Two central Fortresses connected to each other - that can be separated at a moment's notice, housing civilians and soldiers;
Every hospital is by a barracks, in case of were-creature patients/undead patients trying to kill other patients;
A brass palisade at the front;
Explosive hamstones (single pillars covered in memorials to the dead that can be collapsed through a lever causing cave in explosions);
The legendary dining hall is 3zlvls high and full of stone traps/maim traps. Designed to be brutal for any invading force to take, easy to defend. Very inefficient, so a civilian's pathway is connected outside of all the defences - this can be collapsed, and the walkways are covered in fortifications on one side - marksdwarves can rain hell on invaders but if the invaders take the walkways they won't be safe from the necromancer doomsday surprise or the raven bomb;
Two gatehouses (hatehouses really) that divide the surface passageways;
Doors behind every fortification;
At least 2/3rds of the Fort training all year on duty fully armed and armoured in the event of undead/goblin/cavern excursion;
The caverns are connected to the surface via massive quarry ramp;
Specialist anti-supernatural forces, specialist garrisons, snipers, teachers, were-creatures, miner squads (civil conscripts and military trained) science Dwarves;
Barracks everywhere so that on duty forces can kill small forces easily or else hold off larger forces until reinforcements arrive;
A central courtyard open to marksdwarf fire;
Every room is designed to slow down a hostile alien for as long as possible. Berserk axelords and unfortunate were-creatures can be contained with the lock of a door, invading siegers can be held at bay for long enough so that scattered survivors can regroup and ambush invaders room by room in bitter fights that give the Dwarves a tremendous home advantage.
- Casualties are very rare. Buildings are carefully constructed to ensure no accidental deaths, strange moods are rare with the heavy military activity, when offensive forces do show up - they are met with an appropriate reactionary force, often outnumbering the invader. I also try to keep my best armoured and trained troops in the front lines - these all ensure the highest survivability rate possible. Conversely it means that if my army is ever defeated, the Fortress is lost.
This Fort can only be taken by the sky, attrition or surprise.