This is also a
dressage move used in higher levels of
competition. The passage is basically a very slow, animated
trot. The
horse will typically not move faster than a
walk, and will hold each
hoof in the air for a split
second. Back in the
military days, this would have been used for a
parade and other
formal showings. It's incredibly hard to
imagine without a seeing it, but it is one of the more
beautiful movements in
dressage.
Note that in this case, it would be pronounced pa-sage with accent on the sage and a soft g sound.