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[Karakzon]

when using pressure plates, it is imporant to experiment with somehting harmless first, like a door. Care should be taken eather way, the best place for a walk in spike trap pressure plate is before the spike trap corridor, with maybe one or two rows behind the pressure plates for straglers. Entrance triggerd pressure plates may get confused with large groupes of enemys, so ide suggest trying to design some kind of timed repeater for that involving a sealed water based mechanism.

[Samoorai]

I've got a fort where my entrance is two, relatively short tunnels. I intend to have two flood gates, which can be operated to alter the entrance path, leaving my enemies two trap filled passages to reach me. Thus when one is full, I can pull two levers and have the first closed and the second open, and dice more enemies.

Then a single troll comes in and walks straight through your floodgates. Time to reclaim. Learned this lesson well in one of the Sparkgears.

In any case, your defences will depend on your attitude towards your dwarves. Are they just walking bearded meat that occasionally bends to your will? Or do you actually give a crap if they live or die? Well, the useful ones at least. Lazy ass immigrants.

[Karakzon]

unless you use a bridge instead and have a hole in the floor. etc etc.

[Triaxx2]

Sorry. Double flood gates. Didn't see that. The outside flood gate is only for drowning. The internal keeps it from flooding my fortress. If the troll can walk against the flow of water, fine,  the military can deal with it. But otherwise the water should be enough to deal with it.

[Sir Crashalot]

I usually have a large walled and roofed off area above ground outside my entrance, this is where I place my barracks/guard posts so my soldiers are always above ground and never suffer from adaption. The compound has a T shaped entrance to the outside making a 3-5 tile wide pathway to allow for wagons (should they ever return), at the ends of the T I will build a drawbridge (3 total, one at the base of the T connecting to the compound and two for the outer entrances) the triggers for these will be levers down in my dining room. Inside the T entranceway just behind the two outside drawbridges I build two lines of serrated disk traps with two disks in each, out of copper or iron.

When the enemy comes I wait until they are comming past the outer bridges then close all three and see how many are left alive and trapped in the now closed off T entrance. If I feel confident my militia can handle them then I open the inner bridge and send them in to clean up.

After that, I pull my militia back into the compound and open all the bridges to let more in, then just repeat.
It helps a lot when early into a fortress but later on you might want to dismantle the entrance to allow for a challenge because with this kind of defence you wont really be in much danger.



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[thor82]

My military dwarves were fairly crap to begin with, so the drawbridge sealed entrance is a great way to ensure your dwarves live. From there you have plenty of time to train your military properly and get everything else set up. If you're low on metal (or don't want to waste it) and/or your site has sand, 10x green glass spike traps are quite lethal and easy to pump out. Then it's just a matter of linking them all to a single lever (check the hall of death in my first sig link). Pull the lever, set to repeat, laugh maniacally. I was going to line the entire entryway into to Roadhouse with green glass spikes, but my military became invincible.

the traps must be activated? :|

[squeakyReaper]

If you're willing to spend a lot of time, rocks and your mechanic's skill, you can make pressure plates.  I like to have some alternating spots, spikes to plates, which makes it so enemies will usually be impaling themselves (except the last living one, depending on timing).

[Jacos]

Here's what I do;
A long enterance into my fortress, with some fortifications only accessable through my barracks. The hallway, when it reaches the fortifications, goes under it, and then goes towards the fortress. I station my crossbow Dwarves there, so that any approaching invader has to survive a few volleys of bolts before they can get into cover, and then perhaps one last one from behind before they can finally get into the fortress. After that, I make a hallway absolutely FILLED with traps, and then make an alternative route, which takes slightly longer, and designate it a high traffic area, so that all the dwarves, including the mothers with the babies who are vunerable to the traps, avoid it while the enemies pathfinding forces them through the trap riddled corridor. Finally, there is one last corridor before they can reach the fortress or the barracks, and that is where my whole military is waiting for them.

[i2amroy]

I tend to use several goblin grinders side by side and then station my (rather small its like 10 dwarves for my 240 dwarf fort) military on the other side to catch any goblins who get through. Note: if you do do this then you will want to put up some doors on the far side so that dwarves don't go charging into the grinder thus making kind of useless when they are fighting before the goblins hit the traps. With this you can pretty much slaughter your way through just about any size of a goblin attack with little or no injuries at all and it only takes a medium amount of weapon traps to set up as opposed to the large amount needed for long lined corridors. Your dwarves can also walk right through it which makes it superior to a long skinny corridor for hauling purposes.

[Ipslne]

My entrance is kind of long, with a majority of it sectioned off by drawbridges and ready to to collapse floor by floor into the caverns with the pull of a lever. It just so happens that one of these floors includes my legendary dining room; though I'm sure the dorfs will understand. Key point: Don't build your dining room beneath your entrance. That, of course, is the last resort.

Currently, it is crudely rigged to flood and flush everything down into the caverns. Soon it will be rigged to do the same with magma (by soon I mean maybe never. That's a lot of pumping.)

Considering a secondary trap that just tosses goblins back and forth between bridges using pressure plates and a few restless pets.