I admit. I forgot about the Spartans.
From the map Messana looked undefended, so I send full garison of pre marian troops combined with hestatii, principes, velites and italian auxilia.
It took only one turn to realize that a full stack greek army made of 1000 spartans stabbed me in the back and massacred my invading force with nowhere to retreat (ships sunk by greek experienced navy).
Any tips on taking the greeks on Sicily along with troops needed to kill the spartan king with his army?
regards!