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In Moria, we see the orcs climb/crawl the walls and ceilings with ease.

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Yet during the battle at Helm's Deep and the attack on Minas Tirith, they use ladders and mobile towers in an effort scale the walls and gain entry into the strongholds. Although there are other beings such as Uruks that may not be able to climb walls and might require such devices, we see that it is primarily the orcs that use the ladders and towers. Why do the orcs use them? It would actually seem to slow them down if anything.

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    Saruman's orcs are fighting uruk-hai. Maybe the Moria orcs are climbing uruk-hai. Dec 24, 2016 at 1:27
  • Maybe Saruman's offensive coordinator was Darrell Bevell? That guy overthinks everything. Dec 24, 2016 at 1:32
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    You're talking about the movies. Spidergoblins are not in the books. You'd probably have to ask the filmmakers, but their answer would probably be "we think it looks cool".
    – isanae
    Dec 24, 2016 at 1:33
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    Just because you can scale a wall doesn't mean that it's the best way to attack. Their siege towers would have given them protection. Also, climbing a ladder whilst holding a weapon is easier than climbing a wall with a weapon!
    – Möoz
    Dec 24, 2016 at 6:07

2 Answers 2

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The walls were designed to be hard to climb

As mentioned in the comments on the question, the scenes from the films of orcs climbing everywhere in Moria were from Peter Jackson's imagination. There are several breeds of orcs; those from the Mines of Moria are smaller and might be skilled at climbing cave walls (as Jackson imagined), while the Uruk-hai (a large part of the force attacking Helm's Deep) are larger and perhaps no so good at climbing.

It is reasonable to assume that defensive walls are designed to be as smooth as possible and difficult to climb. We know that the Númenóreans who built Orthanc were very skilled at this. The Ents, who had no trouble destroying much of the Ring of Isengard, are defeated by the stones of Orthanc.

Many of the Ents were hurling themselves against the Orthanc-rock; but that defeated them. It is very smooth and hard. Some wizardry is in it, perhaps, older and stronger than Saruman’s. Anyway they could not get a grip on it, or make a crack in it; and they were bruising and wounding themselves against it.

The Lord of the Rings Book Three, Chapter 9: Flotsam and Jetsam

The walls of Minas Tirith were built by the same people and were considered to be unusually strong and smooth.

At first men laughed and did not greatly fear such devices. For the main wall of the City was of great height and marvellous thickness, built ere the power and craft of Númenor waned in exile; and its outward face was like to the Tower of Orthanc, hard and dark and smooth, unconquerable by steel or fire, unbreakable except by some convulsion that would rend the very earth on which it stood.

The Lord of the Rings Book Five, Chapter 4: The Siege of Gondor

Helm's Deep was also built in earlier days by the Númenóreans or their descendants.

At Helm’s Gate, before the mouth of the Deep, there was a heel of rock thrust outward by the northern cliff. There upon its spur stood high walls of ancient stone, and within them was a lofty tower. Men said that in the far-off days of the glory of Gondor the sea-kings had built here this fastness with the hands of giants.

The Lord of the Rings Book Three, Chapter 7: Helm's Deep

If I were sending a horde of orcs to attack a fortress designed by these people, I would send some ladders.

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    Interesting, but since Orcs never climbed walls in the first place, I don't think their smoothness or quality of construction had anything to do with it.
    – isanae
    Dec 24, 2016 at 4:40
  • @isanae I can't think of a mention of them climbing in the books (so yes, Peter Jackson must have thought it looked cool), but those living in the Mines of Moria may well have developed the skill,
    – Blackwood
    Dec 24, 2016 at 13:14
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The Orcs of Moria are fairly small (on par with the hobbits, I judge) and also not burdened with armor or large metal weapons. These features are great for climbing around on the old, cracked stonework of the long-abandoned Moria (abandoned by dwarves, that is) in near-total darkness (great for sneaking up on people); they are not so great for trying to scale tall walls during a major battle in full view of enemy archers. And if you change either feature, you probably can't climb up walls anymore.

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  • Do you have a citation for the size and equipment of the Orcs? Or for their ability to climb walls? As far as I know, they are just regular Orcs and Uruks.
    – isanae
    Dec 24, 2016 at 20:47

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