The Gretchin reference article from the English Wikipedia on 24-Jul-2004
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Gretchin

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In the game world of Warhammer 40,000, Gretchin are basically smaller Orkoids, the equivalent of Warhammer Fantasy Goblins, which are more cowardly than Orks and are usually used as living shields. They are sometimes used to clear mine fields or are stepped on to get through difficult terrain. They are the lowest of the low in Ork society and are often used for the dirtiest jobs like scavenging and playing football with when the Orks get bored.

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