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I asked Richard Borg about this problem.
Here is his answer :
TREBBIA Scenario (BONUS PACK),
Q. There seems to be an error about the depiction of Mago's forces in the Trebbia scenario. Mago and his men are depicted as Romans. The Special rule speaks of a medium cavalry and two medium warriors, but the units depicted are one medium infantry and two medium warriors.
A. We did make a mistake… Mago's forces (not Mogo) are Carthaginian blocks and consist of 1 leader, 1 medium cavalry and 2 medium warriors.