Luckily the battle at krete is pretty easy, as far a i remember (havent played in a while) the AI never uses its cretan archers to kill my levy hoplites or kill some of my spartan bodyguards, so its just about using your crets to shoot down their hoplites behind the walls and win with relative ease, all thx to those Spartans, they can do marvels at the beggining of KH camp.
Oh! i almost forgot the spy u start with, if ur lucky the gates are magically opened for u in DA 1st turn, sweet.