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[Frogwarrior]

So, as you may know, the nastiest monsters in the game have this thing where bridges can't be retracted or raised when those critters are standing on them. Thus, no atom-smashing, and no drop-traps.... OH WAIT!

Build a small platform above the bridge, and put a support holding up a single floor tile on that platform. Link it to a lever. When your beastie crosses the bridge.... the support crumbles, the floor tile falls onto the bridge - and cave-ins instantly DESTROY buildings that they touch! So your critter on the bridge will fall (straight down, unlike normal with a bridge retraction) into whatever you had below.

Then all you have to do is pit all your prisoners down there!

[Mechanoid]

You forgot to mention that you could technically collapse multiple bridges with one lever pull by putting cave in devices above each bridge you want triggered; so you could make a long chain and keep the beastie on the bridges, and give the dwarves more time to pull the lever

[Max White]

Hmm, well done! It seems you have built a trap worthy of containing any non-flying beasty, BUT, can you cage them too?

MUAHAHAHAHAHA!

[Frogwarrior]

Probably not cage them, but if they have a ranged attack you could very possibly devise some way of forcing your enemies to walk right past the hole with the FB inside...
The way I'd do it would be to put the bridge (or bridges) over a one-tile drop into a pit with the walls on one side carved into fortifications, then when the siegers show up make that the only way into your fort.

On the other hand, this is also a much more fun way of restricting fort access. Why boringly retract bridges when you can scuttle them completely?

[Ubiq]

Anybody doing this will have to take into account the fact that seeing the Forgotten Beasts/Titans will result in vast amounts of job cancellation spam even if they're rendered harmless by sheer distance. So any attempt needs to have a way to replace the bridge so that the dwarf will not see the monster during the construction process. That's not too difficult though as it only means that you have to limit the chasm to eight tiles wide at most so that you can anchor the bridge one space away from the edge. Building walls alongside the bridges would also be recommended for the same reason.

[Frogwarrior]

That or keep digging new pits each time

[Ranzear]

I bet if you have a good drop and the floor below covered with cage traps, the resulting stun from impacting the ground should cause most things to get caged.

At worst you can fill the bottom with spike traps and cycle them a few dozen times to kill whatever you like.

[Pilsu]

Does the falling debris crush any spike traps laid underneath the bridge?

Wooden bridges destroyed with magma or dragonfire might also work. Tame building destroyers could also be an asset as long as they're released sufficiently early. That is, assuming they destroy bridges.

[Xenos]

Does the falling debris crush any spike traps laid underneath the bridge?

Wooden bridges destroyed with magma or dragonfire might also work. Tame building destroyers could also be an asset as long as they're released sufficiently early. That is, assuming they destroy bridges.

What about lignite bins?

[shadowform]

So, as you may know, the nastiest monsters in the game have this thing where bridges can't be retracted or raised when those critters are standing on them. Thus, no atom-smashing, and no drop-traps.... OH WAIT!

Build a small platform above the bridge, and put a support holding up a single floor tile on that platform. Link it to a lever. When your beastie crosses the bridge.... the support crumbles, the floor tile falls onto the bridge - and cave-ins instantly DESTROY buildings that they touch! So your critter on the bridge will fall (straight down, unlike normal with a bridge retraction) into whatever you had below.

Then all you have to do is pit all your prisoners down there!

Or, if you want a simpler method that can serve as a guard against any invader, do this.

Spoiler (click to show/hide)

Code: [Select]

* Bridge tile
+ Floor tile
I Support

+***+
+***+
+***+
+***+
*****
*+++*
*+++*
*+++*
*+++*
*+++*
*****
+***+
+***+
+***+
+***+
+***+
+++++


Code: [Select]

side view:

++*******++++++*****++
         I    I

The draw bridge on the far side can be used as a standard airlock setup - keep the outer gate open at all times so caravans can get to the depot built on the floor, close the outer gate and open the inner gate once the caravan's inside to allow your dwarves access - plus it allows the depot area to be collapsed in the event of forgotten beast, titan, siege, or elf caravan since the bridges that surround it don't provide support.  For bonus points, put the following setup beneath it.

Spoiler (click to show/hide)

Code: [Select]

Side view

++**+++++**++
+***I   I***+
+***I   I***+
+   I   I   +
+++++++++++++

basically: a multiple story pit with holes in the side for bridges, which extend out to the point where you want the supports.  Build the bottom support, build a floor and a support on top of it, and repeat.  You end up with a depot that you can not only collapse, but collapse several Z-levels.

[schussel]

i like to circumvent this with a retract bridge that when opened leads into a layer of catacombs divided by several other bridges with accessible places for bait animals .. so you can trap a variety of nasties and release them separately into ambushes (just lock it out while its playing with the siege and reload the bait pet to retrap it under your main bridges when the joy has ended ...


its more controlled even lil more complicated

[crossmr]

could you trap them on an island, and have catapults/balista on either side shooting back and forth?

[Frogwarrior]

Does the falling debris crush any spike traps laid underneath the bridge?

Only directly under the cave-inned tile. That's the beauty of it; if a cave-in hits anywhere on the bridge the WHOLE bridge is deconstructed instantly. So you only need to have a single floor tile hit it anywhere.

And yes, there's no better way to train up siege operating than by taking potshots at a giant steel fluffy wambler.