You don't order the cavalry to attack the enemy, you use it against enemy units that have some space in between them to seperate them, and you order your cavalry to move past the two enemy units. This blasts a larger hole in their line if done correctly with powerful cavalry (round shield cavalry from vanilla need not apply), and then you can get into the enemies rear and also follow up the attack with infantry. It took me quite a bit of time to learn how to use it, and you need to make sure the hole isn't too small to begin with, otherwise you'll get stacked up.
I actually did this yesterday in a Rome vs Spain vanilla battle online, and it worked. I still lost the stupid battle though, Urban Cohorts are ridiculous, even Bull Warriors are no match, so my flanks collapsed despite my success at dividing and routing the Triarii holding the center.
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