Zitat von EU3 Wiki
Cavalry have the best shock modifiers in the game, but are generally useless at delivering fire damage. Moreover, they tend to have relatively low morale and defense values compared to infantry. This makes them able to deliver a punishing first strike (as shock is the first phase), but leaves them vulnerable to being short on morale or being slaughtered in the fire phase - especially from about Land Tech 33 on. However, armies that contain cavalry gain a 'flanking' bonus for up to 4 regiments of cavalry during combat resolution that will greatly improve the damage done by your army. Therefore it is advisable to have around 4 or 5 regiments of cavalry in your army.
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