Ok, to claryfy about "Sacred Band Cavalry". The "Sacred Band" was an ellite infantry unit using the classical hoplite phalanx formation and was disbanded after the total devastation it suffered in Sicely from the army of Syrakuse. The cavalry named sacred band in EB is most likly an elite hevy cavalry used by carthage made of wealthy carthaginian cityzens.
Ofc, i may be mistaken since like i sayed in my previus post i am not a historyan, but thats what is basicly writen in 2-3 articles i have come across. I hope someone with much better knowledge on the subject will clear things up with this.

Btw, sorry about the typos and english, not only it aint my primary language, but i am also dislexic.