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If I remember correctly, in Attack on Titan, it's mentioned or implied a
number of times that humans built the walls to protect themselves from the
titans. (Feel free to correct me if I'm wrong on this.) If so then, how did
they manage to get the walls erected (which seem to be the result of somewhat
extensive work) without getting killed, if they were already under attack by
that point?

(Note: I'm only about halfway through the anime series, so I might just be
missing something that appears later.)


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2014-02-18T01:25:24.320
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attack-on-titan
How were the walls in Attack on Titan built?


If I remember correctly,

> the walls were built with the hardening ability of Titans.

As a result, the walls are very tough to break and have sheltered human kinds
for decades.


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The walls weren't exactly built by humans.

> The walls are all made from 50 meter colossal titans. They are unable to
> move because it is dark inside the walls and they become immobile in the
> dark.

This is shown in the final episode of the anime after the credits.


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2014-05-17T04:54:22.187
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Just adding on the rest of the answers here, but

> "the walls were built with the exoskeletons of titans"

seems to be somewhat different on the [Shingeki no Kyojin
Wikia](http://shingekinokyojin.wikia.com/wiki/Wall_Titan):

> The Wall Titans (幻の巨人 Maboroshi no Kyojin?, Phantom Titans) are unusual kind
> of Titans that make up the Walls that protect humanity. They are first
> revealed when the Female Titan tried to climb Wall Sina to escape from Eren
> and the Survey Corps. The lack of sunlight inside the Walls renders them
> immobile.  
>  
>  It is implied that the Wall Titans have the ability of using their
> crystallizing powers to create massive walls, notably Wall Maria, Rose and
> Sina. Their exact motives for doing this are unknown.

This seems to imply something completely different to what I was thinking. Of
course you can't trust everything you read, but I like to think this
information is pretty accurate.


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2014-05-31T11:32:29.413
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The walls are built by a special breed of titans that the colossal titan is
and this is discovered when a piece of the wall is broken off ![enter image
description here](https://i.stack.imgur.com/XX6Xz.png)

It is also stated [here](http://shingekinokyojin.wikia.com/wiki/Wall_Cult)
that a group of religious fanatics and the king know about the wall being made
of titans.

Though the reason for the wall titans to protect humans is not stated it is
possible that titan shifters made up the wall it is also possible that not all
titans are against humanity considering the size of these titans they could
have preyed on other titans thus providing a motive they wished to prey on
titans and humans attract titans the humans might have trapped them and then
the titans went into hibernation


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2014-12-25T06:40:08.310
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Rod Reiss' ancestors, the first king, used his powers to create the walls (and
Titans?) And wiped all memory of the word before the walls from the mind of
humanity.


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## Spoilers from the manga.

After the king's sanctum incident (ch50~65)

> (when Rod Reiss tried to make Historia eat Eren),

it is disclosed that

> The First King used his Coordinate power (control over titans) to force
> those titans to use their hardening power to shape up the walls, then used
> his Memory power to wipe the memories from the pre-wall era from humanity.

Why did he

> leave hibernating titans inside the walls

is unknown.

> he also created the Wallist Church to help him oversee the walls safety.


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