I was actually quite disappointed by my carthaginan sacred band infantry... I made one unit of them to try them out and used them in my army against the ptolies. In the first battle I was attacked by a single unit of hellenic native spearmen 'reinforcement' in the back, so I decided to try my shiny sacred band against them. What happened? After about 10 minutes of fighting they finally managed to rout those crappy spearmen, loosing half of their unit!