Proper Gander,
"Untrained" is used to make the formation a bit less regular (and "trained" to a lesser degree, with "highly_trained" being very tidy.) The "untrained" stat doesn't work quite like the name would imply--it doesn't make them green and useless. However, it does make pila release a bit slower, because the men don't sync up to throw nearly as rapidly. To get a feel for both effects, compare vanilla Scutarii (who have wide spacing and "untrained") to the "Spanish Mercenaries" sharing the same skin and animation, but trained and with tighter formation.
An untrained, very deep square with a looser barbarian spacing is what CA appears to have used in the screen shots, rather than "horde" which is awful of course.
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