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[ragincajun]

So trying something different (for me) in this go-round.  I am doing a "Skyrim-y" type city where the city is outside and then you have the "mine entrance" at the rear of the city.  So I found a nice embark point with a small canyon with 1+ z-levels above my main outdoor level.  It tapered back to the end of the canyon where I dug in for my mine.  I'm currently building walls to form the foundation of my "keep" that will take up the entire width of the canyon.  Also to note: I've cleared away all the ramps in the canyon, only leaving those at the entrance for the caravans...and hopefully the baddies.

Now for the question...I remember that walls have to be significantly higher than the 1 z-level they used to be.  Is it 3 levels now with a floor on top with a hatch cover?  Does this keep out the baddies, forcing them to venture to the front door? 

I also realize that in the areas that the surrounding cliffs are just 1 z level high, I will need to wall these off as well.  I am planning to do some ramparts off of the main keep that will stretch up to the higher cliff and then wall in up there as well (3 levels assuming that works). 

Just trying to confirm before I build a lot of stuff and then have a goblin horde slide down the cliff anyway and come in the back door.

[Bumber]

Non-climbable walls are as easy as putting a floor jutting out on the side you don't want them climbing from.

Code: [Select]

z+1  ___
z+0 __█__Goblins don't get in, dwarves don't get out. It works because you can't grab onto the side of a floor tile.

Don't try to substitute the floors for walls or fortifications:

Code: [Select]

z+1  █_█
z+0 __█__They'll climb diagonally upwards and over.

This, however, is a safe overhang:

Code: [Select]

z+1  ██_██
z+0 ___█___Although the inner pair of walls might as well be the floors from the first picture. It's merely an example of what can't be climbed.

Safe fortifications:

Code: [Select]

z+2  __
z+1  ╬__
z+0 ___█__Ceiling prevents archers from jumping off the wall and charging the enemy.

[BadLeo]

I thought invaders couldn't climb smooth walls. And I thought walls build with blocks were smooth. 

[Graknorke]

Blocks built with blocks are hard but not impossible to climb. Smoothed natural walls are absolutely impossible.

[Dozebôm Lolumzalìs]

Non-climbable walls are as easy as putting a floor jutting out on the side you don't want them climbing from.

Code: [Select]

z+1  ___
z+0 __█__Goblins don't get in, dwarves don't get out. It works because you can't grab onto the side of a floor tile.

Don't try to substitute the floors for walls or fortifications:

Code: [Select]

z+1  █_█
z+0 __█__They'll climb diagonally upwards and over.

This, however, is a safe overhang:

Code: [Select]

z+1  ██_██
z+0 ___█___Although the inner pair of walls might as well be the floors from the first picture. It's merely an example of what can't be climbed.

Safe fortifications:

Code: [Select]

z+2  __
z+1  ╬__
z+0 ___█__Ceiling prevents archers from jumping off the wall and charging the enemy.

I swear, I'm putting this somewhere I'll never forget it.  This is a wonderfully simple, yet entirely necessary piece of information.  Now my marksdwarves - and fortresses - will live longer.

Although, question: how does the goblin in picture two get over?  And how does picture three prevent said motion, exactly?  I'm just curious as to how a goblin could squeeze through there, though I suppose that's one of the oddities of DF that players just get used to.

[Graknorke]

The goblin climbs outward and up to be hanging on to the next layer of wall before climbing over. In the next picture the goblin can't do that because hanging underneath constructed floors isn't possible.

[Bumber]

Although, question: how does the goblin in picture two get over?  And how does picture three prevent said motion, exactly?  I'm just curious as to how a goblin could squeeze through there, though I suppose that's one of the oddities of DF that players just get used to.

Code: [Select]

z+1  █_█
z+0 _g█__

Code: [Select]

z+1 g█_█
z+0 __█__

Code: [Select]

     g
z+1  █_█
z+0 __█__

Code: [Select]

       g
z+1  █_█
z+0 __█__(The goblin jumps across the top. Jumping takes priority over climbing down into the gap and back up again. The goblin will then climb down on the right side. I believe he would walk off the edge and fall if climbing down was not an option.)

Code: [Select]

z+1  ██_██
z+0 CBA█___A - can grab the wall next to it but can't climb diagonally up because the wall above B is in the way. Tiles (except branches) can't be grabbed from below.
B - Can't initiate climbing.
C - Can't initiate climbing, even if the walls were tree branches.

One more thing. Enemies won't climb unless they can see a target, due to the expense of pathfinding. Any wall is safe as long as they can't see anyone on top or on the other side.

[BadLeo]

<<*masterwork explanation engraved with orthogonal graphics*>>

You, sir, deserves a masterfully prepared kitten tallow roast accompanied of a goo'ol barrel of Sunshine.