How vulnerable do you all think Mago is to cavalry (since we have cavalry superiority in this battle)?

If they are vulnerable (even from the rear), I would like Legio XIII Sphinx, along with 1200 equites from the "Spurius Nouam" (although technically it should be Spurii Novi...but I promised to be such a Latin nazi, so whatever) and 1000 Equites Latini from my third sub-legion, to attack from the rear.

For the rest of the army, I would like Legio Sexta Ferrata (which has already engaged), the "Veteres Spurium", and my 2nd and 3rd sub-legions to advance against the enemy positions (the Veteres Spurium are on the right of the Legio Sexta Ferrata). The remainder of the "Spurius Nouam" and my entire 1st sub-legion shall remain as reserves.

[center][Sphinx + 2200 extra cav] ---------- left flank [Ferrata] [Veteres Spurium] [Minervia sub ii] [Minervia sub iii] right flank|river|[/center]
[center] [Spurius Novam - cav] [Minervia sub i] [/center]

I am always open to ideas.