In the Star Wars movies stormtroopers tend to die from a single hit no matter from what weapon or on what location. A single blaster hit anywhere on their armor is all that is needed to take them out. Even hitting them with a wooden stick or small stones seems to be lethal to them.

If that is the case, what is their armor good for? Has there been any example of a stormtrooper's armor protecting him from any harm?

Durasteel armor would be very effective against gunpowder weapons, this is why slug-throwers are hardly ever used, but as they don't face such weapons on a regular basis, what threats are on a battlefield against which the stormtrooper's armor provides protection?

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    Highly related, arguably a dupe: scifi.stackexchange.com/q/38509/31936. Also related: scifi.stackexchange.com/q/14454/31936.
    – Null
    Sep 14 '16 at 21:13
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    As for the last paragraph, the armor effectively forces the Rebels to use blasters instead of (possibly cheaper and more easily obtained) slugthrowers. If the stormtroopers don't wear armor the Rebels can just use slugthrowers against them. So the armor protects them against the threat of slugthrowers, even if they are never actually attacked by such weapons.
    – Null
    Sep 14 '16 at 21:16
  • Dust storms, maybe?
    – Octopus
    Sep 14 '16 at 21:30
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    The only thing I can think of is that they are protected from embarrassment. At least nobody can see their faces when they are missing the side of a barn.
    – Jane S
    Sep 15 '16 at 4:53
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    Stormtrooper armor is extremely effective. We're just not sure what it's effective against. Sep 15 '16 at 11:39