But legions are way better than normal peltasts, they have the 'AP' attribute which is quite a good addition. I suggest you pick around 4 Phalanx (Secludids' best ones), and as much archers as you can get, along with catas. Beat enemy's archers with yours, then focus all your phalanx on 1 Spartan unit (After weakening it would be better) and you will clash through their wall. Then, if he doesn't turn other phalanx on you, just take them out 1 by 1, and if he does assign the other units to attack you, charge them in the rear/flank with your catas.